$OLP
ONE LIBERTY PROPERTIES INC Stock $olp

$olp Overview Financials Valuation SEC Filings Company Website

2011 Q4 Form 10-K Financial Statement

#000104746913002811 Filed on March 15, 2013

Income Statement

Concept	2011 Q4	2011 Q3	2011 Q2
Revenue	$10.87M	$10.30M	$10.39M
YoY Change	4.15%	-1.62%	0.65%
Cost Of Revenue	$650.0K	$690.0K	$610.0K
YoY Change	-16.67%	72.5%	-22.78%
Gross Profit	$10.22M	$8.690M	$10.11M
YoY Change	5.8%	-13.7%	5.97%
Gross Profit Margin	93.99%	84.4%	97.33%
Selling, General & Admin	$1.770M	$1.740M	$1.980M
YoY Change	9.94%	7.41%	17.16%
% of Gross Profit	17.32%	20.02%	19.58%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$2.300M	$2.430M	$2.340M
YoY Change	6.48%	9.95%	8.84%
% of Gross Profit	22.5%	27.96%	23.15%
Operating Expenses	$4.130M	$5.056M	$4.867M
YoY Change	4.56%	14.99%	28.76%
Operating Profit	$6.090M	$3.634M	$6.097M
YoY Change	6.65%	-40.12%	5.85%
Interest Expense	-$3.130M	$3.150M	$3.224M
YoY Change	-22.14%	-13.89%	-186.67%
% of Operating Profit	-51.4%	86.68%	52.88%
Other Income/Expense, Net	-$100.0K	$10.00K	$40.00K
YoY Change	-350.0%	-75.0%	-76.47%
Pretax Income	$2.830M	$2.330M	$3.890M
YoY Change	93.84%	-2.51%	80.93%
Income Tax	$0.00	$0.00	$0.00
% Of Pretax Income	0.0%	0.0%	0.0%
Net Earnings	$3.085M	$2.765M	$5.142M
YoY Change	88.11%	-2.98%	114.25%
Net Earnings / Revenue	28.37%	26.86%	49.5%
Basic Earnings Per Share	$0.21	$0.19	$0.36
Diluted Earnings Per Share	$0.21	$0.19	$0.35
COMMON SHARES
Basic Shares Outstanding	14.21M shares	14.14M shares	14.08M shares
Diluted Shares Outstanding	14.31M shares	14.14M shares	14.18M shares

Balance Sheet

Concept	2011 Q4	2011 Q3	2011 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$12.70M	$8.400M	$11.40M
YoY Change	64.94%	7.69%	-38.38%
Cash & Equivalents	$12.67M	$8.430M	$11.45M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables	$11.30M	$12.20M	$11.80M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$24.00M	$20.60M	$23.20M
YoY Change	27.66%	5.1%	-22.92%
LONG-TERM ASSETS
Property, Plant & Equipment	$390.4M	$409.0M	$392.3M
YoY Change	-0.36%	8.57%	5.03%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments	$7.400M	$5.700M	$5.900M
YoY Change	34.55%	1.79%	-14.49%
Other Assets	$22.30M	$5.100M	$5.400M
YoY Change	223.19%	-31.08%	-11.48%
Total Long-Term Assets	$428.8M	$431.3M	$414.1M
YoY Change	0.7%	8.56%	4.76%
TOTAL ASSETS
Total Short-Term Assets	$24.00M	$20.60M	$23.20M
Total Long-Term Assets	$428.8M	$431.3M	$414.1M
Total Assets	$452.8M	$451.9M	$437.3M
YoY Change	1.84%	8.4%	2.8%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$6.000M	$5.400M	$4.300M
YoY Change	17.65%	17.39%	7.5%
Deferred Revenue
YoY Change
Short-Term Debt	$20.00M	$20.00M	$4.500M
YoY Change	-44.75%	-28.06%	-83.33%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$30.80M	$30.20M	$13.60M
YoY Change	-31.71%	-15.64%	-60.47%
LONG-TERM LIABILITIES
Long-Term Debt	$197.9M	$197.8M	$198.2M
YoY Change	-8.08%	0.82%	-3.69%
Other Long-Term Liabilities	$5.200M	$5.300M	$5.400M
YoY Change	4.0%	8.16%	8.0%
Total Long-Term Liabilities	$203.1M	$203.1M	$203.6M
YoY Change	-7.81%	0.99%	-3.42%
TOTAL LIABILITIES
Total Short-Term Liabilities	$30.80M	$30.20M	$13.60M
Total Long-Term Liabilities	$203.1M	$203.1M	$203.6M
Total Liabilities	$233.9M	$233.2M	$217.1M
YoY Change	-11.89%	-1.55%	-11.5%
SHAREHOLDERS EQUITY
Retained Earnings	$15.61M
YoY Change	-25.58%
Common Stock	$203.7M
YoY Change	28.62%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$218.3M	$218.7M	$220.2M
YoY Change
Total Liabilities & Shareholders Equity	$452.8M	$451.9M	$437.3M
YoY Change	1.84%	8.4%	2.8%

Cashflow Statement

Concept	2011 Q4	2011 Q3	2011 Q2
OPERATING ACTIVITIES
Net Income	$3.085M	$2.765M	$5.142M
YoY Change	88.11%	-2.98%	114.25%
Depreciation, Depletion And Amortization	$2.300M	$2.430M	$2.340M
YoY Change	6.48%	9.95%	8.84%
Cash From Operating Activities	$5.700M	$6.150M	$4.530M
YoY Change	-4.2%	49.64%	0.44%
INVESTING ACTIVITIES
Capital Expenditures	-$6.520M	-$20.28M	$0.00
YoY Change	-55.92%	152.87%	-100.0%
Acquisitions
YoY Change
Other Investing Activities	-$140.0K	$30.00K	$11.56M
YoY Change	-41.67%	-99.43%	187.56%
Cash From Investing Activities	-$6.680M	-$20.24M	$11.56M
YoY Change	-55.53%	633.33%	-291.71%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	5.210M	11.08M	-16.37M
YoY Change	-42.18%	-192.1%	205.98%
NET CHANGE
Cash From Operating Activities	5.700M	6.150M	4.530M
Cash From Investing Activities	-6.680M	-20.24M	11.56M
Cash From Financing Activities	5.210M	11.08M	-16.37M
Net Change In Cash	4.230M	-3.010M	-280.0K
YoY Change	-7150.0%	-71.82%	-95.92%
FREE CASH FLOW
Cash From Operating Activities	$5.700M	$6.150M	$4.530M
Capital Expenditures	-$6.520M	-$20.28M	$0.00
Free Cash Flow	$12.22M	$26.43M	$4.530M
YoY Change	-41.08%	117.89%	-68.89%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14443000	shares
CY2011Q4	us-gaap	Land Land	123636000	USD
CY2011Q4	us-gaap	Real Estate Investments Unconsolidated Real Estate And Other Joint Ventures RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures	7170000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	12668000	USD
CY2011Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	11264000	USD
CY2011Q4	olp	Unamortized Intangible Lease Assets UnamortizedIntangibleLeaseAssets	11240000	USD
CY2012Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14543000	shares
CY2012Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14596000	shares
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.96
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.81
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.96
CY2010	us-gaap	Depreciation And Amortization DepreciationAndAmortization	7994000	USD
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.18
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.16
CY2011Q4	olp	Escrow Deposits And Other Assets And Receivables EscrowDepositsAndOtherAssetsAndReceivables	3161000	USD
CY2011Q4	olp	Investment In Related Party InvestmentInRelatedParty	235000	USD
CY2011Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	2143000	USD
CY2011Q4	us-gaap	Assets Assets	452821000	USD
CY2011Q4	us-gaap	Secured Debt SecuredDebt	190967000	USD
CY2011Q4	us-gaap	Line Of Credit LineOfCredit	20000000	USD
CY2011Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	4805000	USD
CY2011Q4	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	5967000	USD
CY2011Q4	us-gaap	Liabilities Liabilities	233874000	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	14213000	USD
CY2011Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	189486000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1019000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	15605000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	218285000	USD
CY2011Q4	us-gaap	Minority Interest MinorityInterest	662000	USD
CY2011Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	218947000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	452821000	USD
CY2011Q4	us-gaap	Preferred Stock Value PreferredStockValue		USD
CY2012Q4	us-gaap	Preferred Stock Value PreferredStockValue		USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	237128000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	238059000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	481166000	USD
CY2012Q4	us-gaap	Liabilities Liabilities	243107000	USD
CY2012Q4	us-gaap	Assets Assets	481166000	USD
CY2012Q4	olp	Availableforsale Securities Cumulative Net Unrealized Gain AvailableforsaleSecuritiesCumulativeNetUnrealizedGain	98000	USD
CY2011Q4	olp	Assets Related To Property Held For Sale AssetsRelatedToPropertyHeldForSale	968000	USD
CY2012Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2011Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	12500000	shares
CY2011Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	12500000	shares
CY2012Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2011Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	25000000	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	14598000	shares
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	14598000	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	14213000	shares
CY2011	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	41805000	USD
CY2010	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	37630000	USD
CY2011	us-gaap	Depreciation And Amortization DepreciationAndAmortization	8934000	USD
CY2011	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	6849000	USD
CY2010	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	6148000	USD
CY2011	olp	Costs Of Acquiring Real Estate CostsOfAcquiringRealEstate	213000	USD
CY2012	olp	Operating Leases Annual Fixed Rent OperatingLeasesAnnualFixedRent	296875	USD
CY2011	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	2331000	USD
CY2010	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	1875000	USD
CY2012	olp	Leasehold Rent LeaseholdRent	308000	USD
CY2011	olp	Leasehold Rent LeaseholdRent	308000	USD
CY2010	olp	Leasehold Rent LeaseholdRent	308000	USD
CY2011	us-gaap	Operating Expenses OperatingExpenses	18803000	USD
CY2010	us-gaap	Operating Expenses OperatingExpenses	17528000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	23002000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	20102000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	914000	USD
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	992000	USD
CY2011	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	-35000	USD
CY2010	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	308000	USD
CY2011	us-gaap	Interest Expense InterestExpense	12732000	USD
CY2010	us-gaap	Interest Expense InterestExpense	13492000	USD
CY2011	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	817000	USD
CY2010	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	579000	USD
CY2012	us-gaap	Gain Loss On Sale Of Properties GainLossOnSaleOfProperties	319000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	11572000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	7438000	USD
CY2011	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	1216000	USD
CY2010	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	1633000	USD
CY2012	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	19413000	USD
CY2010	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	235000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	2148000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	1868000	USD
CY2011	us-gaap	Profit Loss ProfitLoss	13720000	USD
CY2010	us-gaap	Profit Loss ProfitLoss	9306000	USD
CY2011	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-4000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	13724000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	9306000	USD
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	13801000	shares
CY2010	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	11465000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	13851000	shares
CY2010	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	11510000	shares
CY2011	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.81
CY2010	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.65
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.15
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.16
CY2011	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.80
CY2010	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.65
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.16
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.16
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.81
CY2012	us-gaap	Revenues Revenues	44750000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	23517000	USD
CY2012	us-gaap	Profit Loss ProfitLoss	32308000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	32320000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.80
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	1.38
CY2012	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.79
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	1.37
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14427000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14527000	shares
CY2012	us-gaap	Costs And Expenses Related Party CostsAndExpensesRelatedParty	2685000	USD
CY2011	us-gaap	Costs And Expenses Related Party CostsAndExpensesRelatedParty	2685000	USD
CY2010	us-gaap	Costs And Expenses Related Party CostsAndExpensesRelatedParty	2083000	USD
CY2012	olp	Real Estate Costs And Expenses Related Party RealEstateCostsAndExpensesRelatedParty	600000	USD
CY2011	olp	Real Estate Costs And Expenses Related Party RealEstateCostsAndExpensesRelatedParty	600000	USD
CY2010	olp	Real Estate Costs And Expenses Related Party RealEstateCostsAndExpensesRelatedParty	600000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	66000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-60000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-747000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-287000	USD
CY2011	olp	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax The Company Share From Joint Venture OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTaxTheCompanyShareFromJointVenture	-182000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-863000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-347000	USD
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	15176068	shares
CY2011	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	12857000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	40569000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	8959000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-4000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	12861000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	8959000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	31749000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	31761000	USD
CY2011	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	1240000	USD
CY2011	olp	Gain On Sales Of Real Estate And Other Assets GainOnSalesOfRealEstateAndOtherAssets	932000	USD
CY2010	olp	Gain On Sales Of Real Estate And Other Assets GainOnSalesOfRealEstateAndOtherAssets	384000	USD
CY2011	us-gaap	Straight Line Rent StraightLineRent	1455000	USD
CY2010	us-gaap	Straight Line Rent StraightLineRent	675000	USD
CY2011	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	467000	USD
CY2010	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	525000	USD
CY2011	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	26000	USD
CY2010	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	-454000	USD
CY2011	us-gaap	Impairment Of Investments ImpairmentOfInvestments	126000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	1009000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	915000	USD
CY2011	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	902000	USD
CY2010	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	978000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	9439000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	8659000	USD
CY2011	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	850000	USD
CY2010	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	610000	USD
CY2011	us-gaap	Increase Decrease In Operating Assets IncreaseDecreaseInOperatingAssets	395000	USD
CY2010	us-gaap	Increase Decrease In Operating Assets IncreaseDecreaseInOperatingAssets	561000	USD
CY2011	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	33000	USD
CY2010	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	1120000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	21636000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	18940000	USD
CY2011	us-gaap	Payments To Acquire And Develop Real Estate PaymentsToAcquireAndDevelopRealEstate	25668000	USD
CY2010	us-gaap	Payments To Acquire And Develop Real Estate PaymentsToAcquireAndDevelopRealEstate	37542000	USD
CY2012	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	36062000	USD
CY2010	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	4136000	USD
CY2011	us-gaap	Payments To Acquire Businesses And Interest In Affiliates PaymentsToAcquireBusinessesAndInterestInAffiliates	669000	USD
CY2011	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	95000	USD
CY2010	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	991000	USD
CY2010	olp	Prepaid Leasehold Improvements PrepaidLeaseholdImprovements	1750000	USD
CY2010	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	6345000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-18627000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-29450000	USD
CY2011	olp	Payments Of Amortization Of Mortgages Payable PaymentsOfAmortizationOfMortgagesPayable	5181000	USD
CY2010	olp	Payments Of Amortization Of Mortgages Payable PaymentsOfAmortizationOfMortgagesPayable	5066000	USD
CY2011	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	15302000	USD
CY2010	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	10689000	USD
CY2011	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	12455000	USD
CY2010	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	7500000	USD
CY2011	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	28500000	USD
CY2010	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	28700000	USD
CY2011	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	44700000	USD
CY2010	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	19500000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	3751000	USD
CY2010	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	1200000	USD
CY2011	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	741000	USD
CY2010	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	1272000	USD
CY2011	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	666000	USD
CY2012Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	335189000	USD
CY2012Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14696000	shares
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	18090000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	10564000	USD
CY2010	us-gaap	Payment Of Financing And Stock Issuance Costs PaymentOfFinancingAndStockIssuanceCosts	103000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1927000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-9794000	USD
CY2011	us-gaap	Interest Paid InterestPaid	13363000	USD
CY2010	us-gaap	Interest Paid InterestPaid	13934000	USD
CY2011	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	4936000	USD
CY2010	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-20304000	USD
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	70000	USD
CY2010	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.23
CY2010	us-gaap	Income Taxes Paid IncomeTaxesPaid	73000	USD
CY2010	us-gaap	Dividends Common Stock Paidinkind DividendsCommonStockPaidinkind	2209000	USD
CY2011	olp	Settlement Of Mortgage Debt SettlementOfMortgageDebt	1259000	USD
CY2011	olp	Noncash Allocation Of Intangible Lease Assets NoncashAllocationOfIntangibleLeaseAssets	2387000	USD
CY2010	olp	Noncash Allocation Of Intangible Lease Assets NoncashAllocationOfIntangibleLeaseAssets	5500000	USD
CY2011	olp	Noncash Allocation Of Intangible Lease Liability NoncashAllocationOfIntangibleLeaseLiability	614000	USD
CY2010	olp	Noncash Allocation Of Intangible Lease Liability NoncashAllocationOfIntangibleLeaseLiability	1040000	USD
CY2011	olp	Reclassification Of Prepaid Allowance To Properties Improvement ReclassificationOfPrepaidAllowanceToPropertiesImprovement	1750000	USD
CY2012	us-gaap	Contribution Of Property ContributionOfProperty	11734000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	7732000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	22314000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	28036000	USD
CY2009Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	180128000	USD
CY2010Q2	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	107000	USD
CY2010	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	14123000	USD
CY2010	olp	Stock Dividend Obligation StockDividendObligation	2104000	USD
CY2010	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	1200000	USD
CY2010	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	915000	USD
CY2010Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	179183000	USD
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	19088000	USD
CY2011	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	40569000	USD
CY2011	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	3751000	USD
CY2011	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	666000	USD
CY2011	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	1009000	USD
CY2012	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.34
CY2011	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	1.32
CY2011	us-gaap	Payments Of Stock Issuance Costs PaymentsOfStockIssuanceCosts	282000	USD
CY2012	us-gaap	Nature Of Operations NatureOfOperations	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b>NOTE 1—ORGANIZATION AND BACKGROUND</b></font></p> <p style="FONT-FAMILY: times"><font size="2">        One Liberty Properties, Inc. ("OLP") was incorporated in 1982 in Maryland. OLP is a self-administered and self-managed real estate investment trust ("REIT"). OLP acquires, owns and manages a geographically diversified portfolio of retail, industrial, health and fitness, office, flex and other properties, a substantial portion of which are under long-term net leases. As of December 31, 2012, OLP owned 93 properties, four of which are owned by consolidated joint ventures. OLP's unconsolidated joint ventures owned a total of seven properties. The 100 properties are located in 29 states.</font></p></div>
CY2012	dei	Entity Registrant Name EntityRegistrantName	ONE LIBERTY PROPERTIES INC
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0000712770
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012Q4	us-gaap	Number Of Real Estate Properties NumberOfRealEstateProperties	100	property
CY2012Q4	us-gaap	Number Of States In Which Entity Operates NumberOfStatesInWhichEntityOperates	29	item
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b><i>Use of Estimates</i></b></font></p> <p style="FONT-FAMILY: times"><font size="2">        The preparation of the consolidated financial statements in conformity with U.S. generally accepted accounting principles ("GAAP") requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.</font></p> <p style="FONT-FAMILY: times"><font size="2">        Management believes that the estimates and assumptions that are most important to the portrayal of the Company's financial condition and results of operations, in that they require management's most difficult, subjective or complex judgments, form the basis of the accounting policies deemed to be most significant to the Company. These significant accounting policies relate to revenues and the value of the Company's real estate portfolio. Management believes its estimates and assumptions related to these significant accounting policies are appropriate under the circumstances; however, should future events or occurrences result in unanticipated consequences, there could be a material impact on the Company's future financial condition or results of operations.</font></p></div>
CY2012	olp	Property Plant And Equipment And Intangible Assets Liabilities Useful Life Maximum PropertyPlantAndEquipmentAndIntangibleAssetsLiabilitiesUsefulLifeMaximum	P35Y
CY2012	us-gaap	Depreciation And Amortization DepreciationAndAmortization	9706000	USD
CY2012Q4	us-gaap	Accumulated Amortization Deferred Finance Costs AccumulatedAmortizationDeferredFinanceCosts	3096000	USD
CY2012	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b><i>Concentration of Credit Risk</i></b></font></p> <p style="FONT-FAMILY: times"><font size="2">        The Company maintains accounts at various financial institutions. While the Company attempts to limit any financial exposure, substantially all of its deposit balances exceed federally insured limits. The Company has not experienced any losses on such accounts.</font></p> <p style="FONT-FAMILY: times"><font size="2">        The Company's properties are located in 29 states. During 2012, 2011 and 2010, excluding rental revenues from the eleven Haverty properties discussed below, 13.9%, 15.3% and 16.5% of rental revenues, respectively, were attributable to real estate investments located in New York and 11.0%, 12.0% and 11.0% of rental revenues, respectively, were attributable to real estate investments located in Pennsylvania. No other state contributed over 10% to the Company's rental revenues.</font></p> <p style="FONT-FAMILY: times"><font size="2">        The Company owns eleven real estate investments that are located in six states and are net leased to Haverty Furniture Companies, Inc., a retail furniture company, pursuant to a master lease. The initial term of the net lease expires August 2022, with several renewal options. These real estate investments, which represented 11.7% of the depreciated book value of real estate investments at December 31, 2012, generated rental revenues of approximately $4,844,000 in each year or 10.8%, 11.6%, and 12.9%, of the Company's total revenues for 2012, 2011 and 2010, respectively.</font></p></div>
CY2012Q4	olp	Investment In Related Party InvestmentInRelatedParty	241000	USD
CY2012Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	129000	USD
CY2012	us-gaap	Proceeds From Sale Of Available For Sale Securities ProceedsFromSaleOfAvailableForSaleSecurities	373000	USD
CY2011Q4	us-gaap	Accumulated Amortization Deferred Finance Costs AccumulatedAmortizationDeferredFinanceCosts	2909000	USD
CY2012	olp	Common Stock Dividends Cash Paid Capital Gain Percentage CommonStockDividendsCashPaidCapitalGainPercentage	0.73	pure
CY2012	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style='font-size:10.0pt;FONT-FAMILY: Times New Roman;'> <p style="FONT-FAMILY: times"><font size="2"><b><i>Reclassification</i></b></font></p> <p style="FONT-FAMILY: times"><font size="2">        Certain amounts reported in previous consolidated financial statements have been reclassified in the accompanying consolidated financial statements to conform to the current year's presentation, primarily to reclassify the transferred assets and liabilities of five properties that were sold in the year ended December 31, 2012 to properties held for sale at December 31, 2011 and to classify the operations of these properties to discontinued operations for all years presented. In addition, the net book value of the Plano, Texas property that was contributed to a joint venture in February 2012 was reclassified from real estate investments to property contributed to joint venture at December 31, 2011. The accounting treatment presentation on the accompanying consolidated statements of income is to reflect the results of this property's operations prospectively following its transfer to the joint venture as "equity in earnings of unconsolidated joint ventures" with no reclassification adjustments for discontinued operations.</font></p> <p style="FONT-FAMILY: times"><font size="2">        The accompanying consolidated financial statements also include a reclassification of the Company's tenant-in-common interest from an investment in real estate to an investment in an unconsolidated joint venture. This reclassification had no impact on previously reported stockholders' equity, net income or earnings per share in any of the historical financial statements issued by the Company. The reclassification transfers the tenant-in-common interest related balances recorded in certain line items on both the balance sheet (real estate investments, unbilled rent receivable, unamortized intangible lease assets, unamortized deferred financing costs and mortgages payable) to investment in unconsolidated joint ventures and the income statement (rental income, depreciation and amortization, real estate expenses, mortgage interest expense and amortization of deferred financing costs) to equity in earnings of unconsolidated joint ventures.</font></p> <p style="FONT-FAMILY: times"><font size="2">        Additionally, the accompanying income statements include the reclassification of state tax expense from general and administrative expense in 2011 and 2010 to federal excise and state taxes to conform to the current year's presentation.</font></p></div>
CY2012	olp	Operating Leases Percentage Increase In Rent Every Five Years OperatingLeasesPercentageIncreaseInRentEveryFiveYears	0.25	pure
CY2012	olp	Operating Leases Frequency For Increase In Rent OperatingLeasesFrequencyForIncreaseInRent	P5Y
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	1104000	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	999000	USD
CY2012Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	132000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	335000	USD
CY2011	us-gaap	Allowance For Doubtful Accounts Receivable Charge Offs AllowanceForDoubtfulAccountsReceivableChargeOffs	1109000	USD
CY2012	olp	Property Plant And Equipment And Intangible Assets Liabilities Useful Life Minimum PropertyPlantAndEquipmentAndIntangibleAssetsLiabilitiesUsefulLifeMinimum	P1Y
CY2012	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	9000	USD
CY2010	us-gaap	Available For Sale Securities Gross Realized Gains AvailableForSaleSecuritiesGrossRealizedGains	149000	USD
CY2010Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	400795000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	3266000	USD
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	2488000	USD
CY2011Q1	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	2700000	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	100000	shares
CY2012	olp	Incremental Common Shares Not Including In Computation Of Earning Per Share IncrementalCommonSharesNotIncludingInComputationOfEarningPerShare	100000	shares
CY2012	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-12000	USD
CY2012	olp	Net Income Loss From Continuing Operations Available To Common Stockholders NetIncomeLossFromContinuingOperationsAvailableToCommonStockholders	11868000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	32320000	USD
CY2012	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	32320000	USD
CY2012	us-gaap	Incremental Common Shares Attributable To Participating Nonvested Shares With Non Forfeitable Dividend Rights IncrementalCommonSharesAttributableToParticipatingNonvestedSharesWithNonForfeitableDividendRights	411000	shares
CY2012	olp	Weighted Average Number Of Diluted Shares Including Unvested Restricted Stock Shares Outstanding WeightedAverageNumberOfDilutedSharesIncludingUnvestedRestrictedStockSharesOutstanding	14938000	shares
CY2012	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	11868000	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	20452000	USD
CY2012	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	1	item
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Accumulated Depreciation RealEstateAndAccumulatedDepreciationAccumulatedDepreciation	62816000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land And Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfLandAndBuildingsAndImprovements	473341000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Buildings And Improvements RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements	335189000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Carrying Amount Of Land RealEstateAndAccumulatedDepreciationCarryingAmountOfLand	138152000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Costs Capitalized Subsequent To Acquisition Improvements RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements	15150000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Buildings And Improvements RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements	320039000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Initial Cost Of Land RealEstateAndAccumulatedDepreciationInitialCostOfLand	138152000	USD
CY2012Q4	us-gaap	Real Estate And Accumulated Depreciation Amount Of Encumbrances RealEstateAndAccumulatedDepreciationAmountOfEncumbrances	225971000	USD
CY2012Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	473341000	USD
CY2011Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	430337000	USD
CY2009Q4	us-gaap	Real Estate Gross At Carrying Value RealEstateGrossAtCarryingValue	382674000	USD
CY2012	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	43004000	USD
CY2011	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	29542000	USD
CY2010	us-gaap	Real Estate Other Acquisitions RealEstateOtherAcquisitions	67825000	USD
CY2010	us-gaap	Real Estate Cost Of Real Estate Sold RealEstateCostOfRealEstateSold	49704000	USD
CY2011Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	54214000	USD
CY2012Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	62816000	USD
CY2010Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	46410000	USD
CY2009Q4	us-gaap	Real Estate Accumulated Depreciation RealEstateAccumulatedDepreciation	39336000	USD
CY2012	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	8602000	USD
CY2011	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	8537000	USD
CY2010	us-gaap	Real Estate Accumulated Depreciation Depreciation Expense RealEstateAccumulatedDepreciationDepreciationExpense	7946000	USD
CY2011	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	733000	USD
CY2010	us-gaap	Real Estate Accumulated Depreciation Real Estate Sold RealEstateAccumulatedDepreciationRealEstateSold	872000	USD
CY2012	us-gaap	Pension Expense PensionExpense	128000	USD
CY2011	us-gaap	Pension Expense PensionExpense	119000	USD
CY2010	us-gaap	Pension Expense PensionExpense	114000	USD
CY2012	olp	Revenues Including Revenue From Discontinued Operations As Previously Reported RevenuesIncludingRevenueFromDiscontinuedOperationsAsPreviouslyReported	45699000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	-949000	USD
CY2012Q1	olp	Revenues Including Revenue From Discontinued Operations As Previously Reported RevenuesIncludingRevenueFromDiscontinuedOperationsAsPreviouslyReported	11308000	USD
CY2012Q1	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	-550000	USD
CY2012Q1	us-gaap	Revenues Revenues	10758000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	2962000	USD
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	264000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	3223000	USD
CY2012Q2	olp	Revenues Including Revenue From Discontinued Operations As Previously Reported RevenuesIncludingRevenueFromDiscontinuedOperationsAsPreviouslyReported	11375000	USD
CY2012Q2	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	-273000	USD
CY2012Q2	us-gaap	Revenues Revenues	11102000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.20
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.02
CY2011Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.18
CY2011Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.03
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.01
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.21
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	5750000	USD
CY2012Q3	olp	Revenues Including Revenue From Discontinued Operations As Previously Reported RevenuesIncludingRevenueFromDiscontinuedOperationsAsPreviouslyReported	11459000	USD
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	1.03
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.23
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.21
CY2012Q3	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	-126000	USD
CY2012Q3	us-gaap	Revenues Revenues	11333000	USD
CY2012Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.17
CY2012Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	3001000	USD
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	15419000	USD
CY2012Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.16
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.33
CY2011Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.27
CY2011Q2	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	-521000	USD
CY2011Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	227000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	18414000	USD
CY2012Q4	olp	Revenues Including Revenue From Discontinued Operations As Previously Reported RevenuesIncludingRevenueFromDiscontinuedOperationsAsPreviouslyReported	11557000	USD
CY2012Q4	us-gaap	Revenues Revenues	11557000	USD
CY2012Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	2627000	USD
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.19
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.21
CY2012Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.17
CY2012Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	2281000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	4933000	USD
CY2012Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.16
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.33
CY2012Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14289000	shares
CY2011Q1	olp	Revenues Including Revenue From Discontinued Operations As Previously Reported RevenuesIncludingRevenueFromDiscontinuedOperationsAsPreviouslyReported	10992000	USD
CY2011Q1	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	-743000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	-2325000	USD
CY2012Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14389000	shares
CY2011Q2	olp	Revenues Including Revenue From Discontinued Operations As Previously Reported RevenuesIncludingRevenueFromDiscontinuedOperationsAsPreviouslyReported	10908000	USD
CY2011Q3	olp	Revenues Including Revenue From Discontinued Operations As Previously Reported RevenuesIncludingRevenueFromDiscontinuedOperationsAsPreviouslyReported	10817000	USD
CY2011Q1	us-gaap	Revenues Revenues	10249000	USD
CY2011Q2	us-gaap	Revenues Revenues	10387000	USD
CY2012Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14378000	shares
CY2012Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14478000	shares
CY2011Q3	us-gaap	Revenues Revenues	10296000	USD
CY2011Q4	us-gaap	Revenues Revenues	10873000	USD
CY2011	us-gaap	Revenues Revenues	41805000	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	2327000	USD
CY2011Q2	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	3880000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	2538000	USD
CY2011Q4	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	2827000	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.18
CY2011Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.27
CY2011Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	405000	USD
CY2011Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	1262000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	2732000	USD
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.22
CY2012Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.20
CY2011Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.17
CY2011Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.19
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	5142000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	2765000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	3085000	USD
CY2011Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	13117000	shares
CY2011Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.03
CY2011Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.08
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.20
CY2011Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14078000	shares
CY2011Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14143000	shares
CY2011Q4	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	14210000	shares
CY2011Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	13117000	shares
CY2011Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14178000	shares
CY2011Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14143000	shares
CY2011Q4	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	14310000	shares
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.21
CY2012Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.22
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.17
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.39
CY2012Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.22
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.17
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.39
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.20
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	1.04
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.24
CY2011Q4	olp	Revenues Including Revenue From Discontinued Operations As Previously Reported RevenuesIncludingRevenueFromDiscontinuedOperationsAsPreviouslyReported	11413000	USD
CY2011	olp	Revenues Including Revenue From Discontinued Operations As Previously Reported RevenuesIncludingRevenueFromDiscontinuedOperationsAsPreviouslyReported	44130000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	14577000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Five Years OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears	35303000	USD
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.35
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.19
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.21
CY2011	us-gaap	Participating Securities Distributed And Undistributed Earnings ParticipatingSecuritiesDistributedAndUndistributedEarnings	460000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.17
CY2011Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.19
CY2012	us-gaap	Depreciation And Amortization Discontinued Operations DepreciationAndAmortizationDiscontinuedOperations	260000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Thereafter OperatingLeasesFutureMinimumPaymentsReceivableThereafter	201284000	USD
CY2011Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.09
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.36
CY2012Q4	olp	Unamortized Intangible Lease Assets UnamortizedIntangibleLeaseAssets	16491000	USD
CY2010	olp	Dividends Designated To Previous Year DividendsDesignatedToPreviousYear	3844000	USD
CY2011	olp	Net Income Loss From Continuing Operations Available To Common Stockholders NetIncomeLossFromContinuingOperationsAvailableToCommonStockholders	11116000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	13264000	USD
CY2010	olp	Dividends Designated From Following Year DividendsDesignatedFromFollowingYear	1448000	USD
CY2011	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	13264000	USD
CY2011	olp	Dividend Paid Deduction From Taxable Income DividendPaidDeductionFromTaxableIncome	13463000	USD
CY2010	olp	Dividend Paid Deduction From Taxable Income DividendPaidDeductionFromTaxableIncome	11835000	USD
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	50000	shares
CY2010Q3	olp	Incremental Common Shares Attributable To Share Based Payment Arrangements Underlying Shares IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsUnderlyingShares	100000	shares
CY2011	olp	Reconciliation Of Income From Book Basis To Tax Basis Rent Adjustment ReconciliationOfIncomeFromBookBasisToTaxBasisRentAdjustment	1419000	USD
CY2012	olp	Percentage Of Discount On Common Stock Purchased Through Dividend Reinvestment Plan PercentageOfDiscountOnCommonStockPurchasedThroughDividendReinvestmentPlan	0.05	pure
CY2010	olp	Reconciliation Of Income From Book Basis To Tax Basis Rent Adjustment ReconciliationOfIncomeFromBookBasisToTaxBasisRentAdjustment	693000	USD
CY2010	olp	Reconciliation Of Income From Book Basis To Tax Basis Gain On Sales Of Properties ReconciliationOfIncomeFromBookBasisToTaxBasisGainOnSalesOfProperties	557000	USD
CY2010	olp	Reconciliation Of Income From Book Basis To Tax Basis Rental Income Advance Net ReconciliationOfIncomeFromBookBasisToTaxBasisRentalIncomeAdvanceNet	205000	USD
CY2010	olp	Reconciliation Of Income From Book Basis To Tax Basis Financial Statement Adjustment For Above And Below Market Leases ReconciliationOfIncomeFromBookBasisToTaxBasisFinancialStatementAdjustmentForAboveAndBelowMarketLeases	-442000	USD
CY2010	olp	Reconciliation Of Income From Book Basis To Tax Basis Non Deductible Share Based Compensation Cost ReconciliationOfIncomeFromBookBasisToTaxBasisNonDeductibleShareBasedCompensationCost	249000	USD
CY2010	olp	Reconciliation Of Income From Book Basis To Tax Basis Depreciation And Amortization ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization	1051000	USD
CY2010	olp	Reconciliation Of Income From Book Basis To Tax Basis Property Acquisition Cost Capitalized For Tax Purpose ReconciliationOfIncomeFromBookBasisToTaxBasisPropertyAcquisitionCostCapitalizedForTaxPurpose	1010000	USD
CY2010	olp	Reconciliation Of Income From Book Basis To Tax Basis Other Adjustments ReconciliationOfIncomeFromBookBasisToTaxBasisOtherAdjustments	542000	USD
CY2010	olp	Reconciliation Of Income From Book Basis To Tax Basis Profit Loss Tax Basis ReconciliationOfIncomeFromBookBasisToTaxBasisProfitLossTaxBasis	11785000	USD
CY2011	olp	Dividend Reinvestment Plan Common Stock Discount On Shares DividendReinvestmentPlanCommonStockDiscountOnShares	153000	USD
CY2010	olp	Dividend Reinvestment Plan Common Stock Discount On Shares DividendReinvestmentPlanCommonStockDiscountOnShares	108000	USD
CY2011	olp	Dividends Before Adjustments For Previous And Current Year DividendsBeforeAdjustmentsForPreviousAndCurrentYear	14911000	USD
CY2010	olp	Dividends Before Adjustments For Previous And Current Year DividendsBeforeAdjustmentsForPreviousAndCurrentYear	14231000	USD
CY2011	olp	Dividends Designated To Previous Year DividendsDesignatedToPreviousYear	1448000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	102000	USD
CY2010	olp	Discontinued Operation Number Of Properties Sold Whose Net Gain And Operations Are Included In Discontinued Operations DiscontinuedOperationNumberOfPropertiesSoldWhoseNetGainAndOperationsAreIncludedInDiscontinuedOperations	2	property
CY2012	us-gaap	Disposal Group Including Discontinued Operation Rental Income DisposalGroupIncludingDiscontinuedOperationRentalIncome	1733000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Rental Income DisposalGroupIncludingDiscontinuedOperationRentalIncome	2446000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Rental Income DisposalGroupIncludingDiscontinuedOperationRentalIncome	3265000	USD
CY2012Q4	olp	Escrow Deposits And Other Assets And Receivables EscrowDepositsAndOtherAssetsAndReceivables	3741000	USD
CY2011	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	932000	USD
CY2011	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	11544000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	332000	USD
CY2012	olp	Disposal Group Including Discontinued Operation Costs And Expenses DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses	694000	USD
CY2012	us-gaap	Discontinued Operation Income Loss From Discontinued Operation During Phase Out Period Net Of Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax	1039000	USD
CY2012	olp	Number Of Unconsolidated Joint Ventures NumberOfUnconsolidatedJointVentures	7	item
CY2011	us-gaap	Depreciation And Amortization Discontinued Operations DepreciationAndAmortizationDiscontinuedOperations	505000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	257000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	468000	USD
CY2011	olp	Disposal Group Including Discontinued Operation Costs And Expenses DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses	1230000	USD
CY2012Q4	olp	Number Of Properties Owned And Operated By Each Unconsolidated Joint Venture NumberOfPropertiesOwnedAndOperatedByEachUnconsolidatedJointVenture	1	property
CY2010	us-gaap	Depreciation And Amortization Discontinued Operations DepreciationAndAmortizationDiscontinuedOperations	665000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Operating Expense DisposalGroupIncludingDiscontinuedOperationOperatingExpense	261000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Interest Expense DisposalGroupIncludingDiscontinuedOperationInterestExpense	706000	USD
CY2010	olp	Disposal Group Including Discontinued Operation Costs And Expenses DisposalGroupIncludingDiscontinuedOperationCostsAndExpenses	1632000	USD
CY2012Q4	us-gaap	Real Estate Investments Unconsolidated Real Estate And Other Joint Ventures RealEstateInvestmentsUnconsolidatedRealEstateAndOtherJointVentures	19485000	USD
CY2010	us-gaap	Gains Losses On Sales Of Investment Real Estate GainsLossesOnSalesOfInvestmentRealEstate	107000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	1368000	USD
CY2012	olp	Equity Method Investment Income From Net Settlement With Former Tenant EquityMethodInvestmentIncomeFromNetSettlementWithFormerTenant	233000	USD
CY2010Q2	us-gaap	Proceeds From Sale Of Real Estate Heldforinvestment ProceedsFromSaleOfRealEstateHeldforinvestment	3171000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	93047000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable OperatingLeasesFutureMinimumPaymentsReceivable	402882000	USD
CY2012Q4	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	3477000	USD
CY2012Q4	us-gaap	Secured Debt SecuredDebt	225971000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	8039000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	37393000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	13216000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	31187000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	43089000	USD
CY2012Q4	us-gaap	Available For Sale Equity Securities Amortized Cost Basis AvailableForSaleEquitySecuritiesAmortizedCostBasis	150000	USD
CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	1000	USD
CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Gain Loss AvailableForSaleSecuritiesGrossUnrealizedGainLoss	128000	USD
CY2012	olp	Number Of Derivative Agreements In Which Parent Company Could Be Liable In Event Of Subsidiary Default NumberOfDerivativeAgreementsInWhichParentCompanyCouldBeLiableInEventOfSubsidiaryDefault	1	item
CY2012	us-gaap	Operating Expenses OperatingExpenses	21233000	USD
CY2010	olp	Deferred Rent Receivable Written Off DeferredRentReceivableWrittenOff	1152000	USD
CY2012	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	44616000	USD
CY2011	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	28000000	USD
CY2012Q2	olp	Number Of Acquired Properties For Which Purchase Price Allocations Is In Finalization Process NumberOfAcquiredPropertiesForWhichPurchasePriceAllocationsIsInFinalizationProcess	6	item
CY2012	olp	Costs Of Acquiring Real Estate CostsOfAcquiringRealEstate	823000	USD
CY2012	olp	Real Estate Properties Acquisition Occupancy Percentage RealEstatePropertiesAcquisitionOccupancyPercentage	1.00	pure
CY2012	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	800000	USD
CY2010	olp	Number Of Real Estate Properties Acquired NumberOfRealEstatePropertiesAcquired	14	property
CY2010	us-gaap	Payments To Acquire Real Estate PaymentsToAcquireRealEstate	72300000	USD
CY2010	olp	Number Of Real Estate Properties Sold NumberOfRealEstatePropertiesSold	2	property
CY2010	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	45677000	USD
CY2010	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	10007000	USD
CY2010	us-gaap	Business Acquisition Pro Forma Earnings Per Share Basic BusinessAcquisitionProFormaEarningsPerShareBasic	0.87
CY2010	us-gaap	Business Acquisition Pro Forma Earnings Per Share Diluted BusinessAcquisitionProFormaEarningsPerShareDiluted	0.87
CY2010	us-gaap	Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual	3488000	USD
CY2010	us-gaap	Business Combination Pro Forma Information Earnings Or Loss Of Acquiree Since Acquisition Date Actual BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual	440000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable Current OperatingLeasesFutureMinimumPaymentsReceivableCurrent	45779000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Two Years OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears	43324000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Three Years OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears	39565000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Receivable In Four Years OperatingLeasesFutureMinimumPaymentsReceivableInFourYears	37627000	USD
CY2012	olp	Number Of Vacant Properties NumberOfVacantProperties	1	property
CY2011Q4	olp	Deferred Rent Receivables Related To Property Held For Sale DeferredRentReceivablesRelatedToPropertyHeldForSale	263000	USD
CY2012	olp	Deferred Rent Receivable Period During Which Amount Of Rent To Be Billed And Received DeferredRentReceivablePeriodDuringWhichAmountOfRentToBeBilledAndReceived	P19Y
CY2012Q4	us-gaap	Deferred Rent Receivables Net DeferredRentReceivablesNet	12629000	USD
CY2012	olp	Deferred Rent Receivable Written Off DeferredRentReceivableWrittenOff	256000	USD
CY2011	olp	Deferred Rent Receivable Written Off DeferredRentReceivableWrittenOff	118000	USD
CY2012	olp	Deferred Rent Receivable Written Off Relating To Property Sold DeferredRentReceivableWrittenOffRelatingToPropertySold	149000	USD
CY2012	olp	Deferred Rent Receivable Written Off Relating To Property Vacated By Former Tenant DeferredRentReceivableWrittenOffRelatingToPropertyVacatedByFormerTenant	1003000	USD
CY2011Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	430337000	USD
CY2012Q4	us-gaap	Real Estate Investment Property At Cost RealEstateInvestmentPropertyAtCost	473341000	USD
CY2011Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	54214000	USD
CY2012Q4	us-gaap	Real Estate Investment Property Accumulated Depreciation RealEstateInvestmentPropertyAccumulatedDepreciation	62816000	USD
CY2011Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	376123000	USD
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.34
CY2010	us-gaap	Equity Method Investment Realized Gain Loss On Disposal EquityMethodInvestmentRealizedGainLossOnDisposal	107000	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	20452000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	11856000	USD
CY2011Q4	us-gaap	Investment Building And Building Improvements InvestmentBuildingAndBuildingImprovements	306701000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1223000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	1009000	USD
CY2010	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	915000	USD
CY2012	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	214620	shares
CY2011	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	254502	shares
CY2010	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	81154	shares
CY2012	olp	Operating Leases Number Of Five Year Extension Options OperatingLeasesNumberOfFiveYearExtensionOptions	5	item
CY2012	olp	Operating Leases Number Of Seven Months Extension Options OperatingLeasesNumberOfSevenMonthsExtensionOptions	1	item
CY2012Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	3272000	USD
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.32
CY2011	us-gaap	Tenant Reimbursements TenantReimbursements	794000	USD
CY2010	us-gaap	Tenant Reimbursements TenantReimbursements	496000	USD
CY2012	us-gaap	Tenant Reimbursements TenantReimbursements	947000	USD
CY2010	us-gaap	Loans Assumed1 LoansAssumed1	33548000	USD
CY2012	us-gaap	Payments Of Distributions To Affiliates PaymentsOfDistributionsToAffiliates	290000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	2148000	USD
CY2011	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	11576000	USD
CY2011	olp	Weighted Average Number Of Diluted Shares Including Unvested Restricted Stock Shares Outstanding WeightedAverageNumberOfDilutedSharesIncludingUnvestedRestrictedStockSharesOutstanding	13851000	shares
CY2012Q4	us-gaap	Real Estate Investment Property Net RealEstateInvestmentPropertyNet	410525000	USD
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.23
CY2011Q4	olp	Deferred Rent Receivables Related To Property Transferred To Joint Venture DeferredRentReceivablesRelatedToPropertyTransferredToJointVenture	84000	USD
CY2011	us-gaap	Other Than Temporary Impairment Losses Investments Availableforsale Securities OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities	126000	USD
CY2012	olp	Operating Leases Extension Period First Five Renewal Options OperatingLeasesExtensionPeriodFirstFiveRenewalOptions	P5Y
CY2012	olp	Operating Leases Extension Period Last Renewal Option OperatingLeasesExtensionPeriodLastRenewalOption	P7M
CY2010	olp	Cash Dividends Paid Reconciliation CashDividendsPaidReconciliation	14123000	USD
CY2011	olp	Cash Dividends Paid Reconciliation CashDividendsPaidReconciliation	14758000	USD
CY2012	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	241000	USD
CY2012	olp	Share Based Compensation Arrangement By Share Based Payment Award Weighted Average Award Vesting Period ShareBasedCompensationArrangementByShareBasedPaymentAwardWeightedAverageAwardVestingPeriod	P3Y
CY2012Q4	us-gaap	Land Land	138152000	USD
CY2012	us-gaap	Interest Expense InterestExpense	12813000	USD
CY2012	us-gaap	Income Taxes Paid IncomeTaxesPaid	68000	USD
CY2012	olp	Noncash Allocation Of Intangible Lease Assets NoncashAllocationOfIntangibleLeaseAssets	6641000	USD
CY2011Q4	us-gaap	Real Estate Investments Joint Ventures RealEstateInvestmentsJointVentures	11842000	USD
CY2011Q4	us-gaap	Real Estate Heldforsale RealEstateHeldforsale	16975000	USD
CY2012Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	5252000	USD
CY2012Q4	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	6584000	USD
CY2012Q4	us-gaap	Off Market Lease Unfavorable OffMarketLeaseUnfavorable	5300000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	14598000	USD
CY2012Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	196107000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1578000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	28001000	USD
CY2012Q4	us-gaap	Minority Interest MinorityInterest	931000	USD
CY2011Q4	us-gaap	Liabilities Of Assets Held For Sale LiabilitiesOfAssetsHeldForSale	6970000	USD
CY2012	us-gaap	Real Estate Revenue Net RealEstateRevenueNet	44750000	USD
CY2012	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	7317000	USD
CY2012	us-gaap	Direct Costs Of Leased And Rented Property Or Equipment DirectCostsOfLeasedAndRentedPropertyOrEquipment	2622000	USD
CY2012	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	776000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	11000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-547000	USD
CY2012	olp	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax The Company Share From Joint Venture OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTaxTheCompanyShareFromJointVenture	-23000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-559000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-12000	USD
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	19924000	USD
CY2012	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	2131000	USD
CY2012	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	3652000	USD
CY2012	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	571000	USD
CY2012	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	290000	USD
CY2012	us-gaap	Adjustments To Additional Paid In Capital Share Based Compensation Restricted Stock Units Requisite Service Period Recognition AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition	1223000	USD
CY2012	olp	Gain On Sales Of Real Estate And Other Assets GainOnSalesOfRealEstateAndOtherAssets	19741000	USD
CY2012	us-gaap	Straight Line Rent StraightLineRent	1354000	USD
CY2012	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	-117000	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	1223000	USD
CY2012	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	1016000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	9966000	USD
CY2012	us-gaap	Increase Decrease In Operating Assets IncreaseDecreaseInOperatingAssets	492000	USD
CY2012	us-gaap	Increase Decrease In Operating Liabilities IncreaseDecreaseInOperatingLiabilities	71000	USD
CY2012	us-gaap	Payments To Acquire And Develop Real Estate PaymentsToAcquireAndDevelopRealEstate	44088000	USD
CY2012	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	145000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-12915000	USD
CY2012	olp	Payments Of Amortization Of Mortgages Payable PaymentsOfAmortizationOfMortgagesPayable	5533000	USD
CY2012	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	32422000	USD
CY2012	us-gaap	Proceeds From Issuance Of Secured Debt ProceedsFromIssuanceOfSecuredDebt	65989000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	2131000	USD
CY2012	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	14550000	USD
CY2012	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	34550000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock Dividend Reinvestment Plan ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan	3652000	USD
CY2012	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	2111000	USD
CY2012	us-gaap	Proceeds From Contributions From Affiliates ProceedsFromContributionsFromAffiliates	571000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	19477000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-7490000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	1909000	USD
CY2012	us-gaap	Interest Paid InterestPaid	13088000	USD
CY2011	olp	Reconciliation Of Income From Book Basis To Tax Basis Property Acquisition Cost Capitalized For Tax Purpose ReconciliationOfIncomeFromBookBasisToTaxBasisPropertyAcquisitionCostCapitalizedForTaxPurpose	268000	USD
CY2011	olp	Reconciliation Of Income From Book Basis To Tax Basis Other Adjustments ReconciliationOfIncomeFromBookBasisToTaxBasisOtherAdjustments	-516000	USD
CY2012	olp	Noncash Allocation Of Intangible Lease Liability NoncashAllocationOfIntangibleLeaseLiability	588000	USD
CY2011	olp	Reconciliation Of Income From Book Basis To Tax Basis Profit Loss Tax Basis ReconciliationOfIncomeFromBookBasisToTaxBasisProfitLossTaxBasis	13413000	USD
CY2010	olp	Costs Of Acquiring Real Estate CostsOfAcquiringRealEstate	1010000	USD
CY2011	olp	Reconciliation Of Income From Book Basis To Tax Basis Depreciation And Amortization ReconciliationOfIncomeFromBookBasisToTaxBasisDepreciationAndAmortization	1042000	USD
CY2012	us-gaap	Allowance For Doubtful Accounts Receivable Charge Offs AllowanceForDoubtfulAccountsReceivableChargeOffs	86000	USD
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	30000	shares
CY2012	olp	Weighted Average Number Of Shares Outstanding Including Unvested Restricted Stock Shares Basic WeightedAverageNumberOfSharesOutstandingIncludingUnvestedRestrictedStockSharesBasic	14838000	shares
CY2011	olp	Weighted Average Number Of Shares Outstanding Including Unvested Restricted Stock Shares Basic WeightedAverageNumberOfSharesOutstandingIncludingUnvestedRestrictedStockSharesBasic	13801000	shares
CY2012	olp	Allowance For Doubtful Accounts Receivable Recoveries Number Of Tenants AllowanceForDoubtfulAccountsReceivableRecoveriesNumberOfTenants	1	item
CY2012	olp	Number Of Properties As Transferred Assets And Liabilities Which Sold To Be Reclassified As Properties Held For Sale NumberOfPropertiesAsTransferredAssetsAndLiabilitiesWhichSoldToBeReclassifiedAsPropertiesHeldForSale	5	item
CY2012	olp	Subsequent Disqualification Period If Failed To Qualify As Reit SubsequentDisqualificationPeriodIfFailedToQualifyAsREIT	P4Y
CY2011Q4	olp	Assets Related To Property Contributed To Joint Venture AssetsRelatedToPropertyContributedToJointVenture	84000	USD
CY2011	olp	Incremental Common Shares Not Including In Computation Of Earning Per Share IncrementalCommonSharesNotIncludingInComputationOfEarningPerShare	100000	shares
CY2010	olp	Incremental Common Shares Not Including In Computation Of Earning Per Share IncrementalCommonSharesNotIncludingInComputationOfEarningPerShare	100000	shares
CY2011Q4	olp	Availableforsale Securities Cumulative Net Unrealized Gain AvailableforsaleSecuritiesCumulativeNetUnrealizedGain	86000	USD
CY2011	olp	Reconciliation Of Income From Book Basis To Tax Basis Gain On Sales Of Properties ReconciliationOfIncomeFromBookBasisToTaxBasisGainOnSalesOfProperties	61000	USD
CY2011	olp	Reconciliation Of Income From Book Basis To Tax Basis Rental Income Advance Net ReconciliationOfIncomeFromBookBasisToTaxBasisRentalIncomeAdvanceNet	-78000	USD
CY2011	olp	Reconciliation Of Income From Book Basis To Tax Basis Financial Statement Adjustment For Above And Below Market Leases ReconciliationOfIncomeFromBookBasisToTaxBasisFinancialStatementAdjustmentForAboveAndBelowMarketLeases	31000	USD
CY2011	olp	Reconciliation Of Income From Book Basis To Tax Basis Non Deductible Share Based Compensation Cost ReconciliationOfIncomeFromBookBasisToTaxBasisNonDeductibleShareBasedCompensationCost	300000	USD
CY2011Q3	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	-521000	USD
CY2011Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.02
CY2011Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.02
CY2011Q4	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	-540000	USD
CY2011Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax IncomeLossFromDiscontinuedOperationsNetOfTax	254000	USD
CY2011Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.02
CY2011Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.02
CY2012	olp	Federal Excise And State Tax Paid And Or Accrued FederalExciseAndStateTaxPaidAndOrAccrued	457000	USD
CY2011	olp	Federal Excise And State Tax Paid And Or Accrued FederalExciseAndStateTaxPaidAndOrAccrued	168000	USD
CY2010	olp	Federal Excise And State Tax Paid And Or Accrued FederalExciseAndStateTaxPaidAndOrAccrued	193000	USD
CY2012	olp	Federal Excise Tax Accrued On Undistributed Taxable Income FederalExciseTaxAccruedOnUndistributedTaxableIncome	290000	USD
CY2012	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	4969000	USD
CY2012	us-gaap	Payments For Lease Commissions PaymentsForLeaseCommissions	438000	USD
CY2011	us-gaap	Payments For Lease Commissions PaymentsForLeaseCommissions	183000	USD
CY2010	us-gaap	Payments For Lease Commissions PaymentsForLeaseCommissions	422000	USD
CY2011	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	3746000	USD
CY2010	us-gaap	Payments To Develop Real Estate Assets PaymentsToDevelopRealEstateAssets	1208000	USD
CY2012	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	35000	USD
CY2011	us-gaap	Interest Paid Capitalized InterestPaidCapitalized	36000	USD
CY2012Q1	us-gaap	Profit Loss ProfitLoss	3226000	USD
CY2012Q2	us-gaap	Profit Loss ProfitLoss	5754000	USD
CY2012Q3	us-gaap	Profit Loss ProfitLoss	18420000	USD
CY2012Q4	us-gaap	Profit Loss ProfitLoss	4908000	USD
CY2011Q1	us-gaap	Profit Loss ProfitLoss	2732000	USD
CY2011Q2	us-gaap	Profit Loss ProfitLoss	5142000	USD
CY2011Q3	us-gaap	Profit Loss ProfitLoss	2765000	USD
CY2011Q4	us-gaap	Profit Loss ProfitLoss	3081000	USD
CY2012Q4	olp	Real Estate Federal Income Tax Basis Difference Amount RealEstateFederalIncomeTaxBasisDifferenceAmount	25718000	USD

Files In Submission

Name	View Source	Status
0001047469-13-002811-index-headers.html	Edgar Link	pending
0001047469-13-002811-index.html	Edgar Link	pending
0001047469-13-002811.txt	Edgar Link	pending
0001047469-13-002811-xbrl.zip	Edgar Link	pending
a2213555z10-k.htm	Edgar Link	pending
a2213555zex-21_1.htm	Edgar Link	pending
a2213555zex-23_1.htm	Edgar Link	pending
a2213555zex-31_1.htm	Edgar Link	pending
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a2213555zex-32_1.htm	Edgar Link	pending
a2213555zex-32_2.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
g281975.jpg	Edgar Link	pending
olp-20121231.xml	Edgar Link	completed
olp-20121231.xsd	Edgar Link	pending
olp-20121231_cal.xml	Edgar Link	unprocessable
olp-20121231_def.xml	Edgar Link	unprocessable
olp-20121231_lab.xml	Edgar Link	unprocessable
olp-20121231_pre.xml	Edgar Link	unprocessable
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$OLP
ONE LIBERTY PROPERTIES INC Stock $olp

2011 Q4 Form 10-K Financial Statement

#000104746913002811 Filed on March 15, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OLP ONE LIBERTY PROPERTIES INC Stock $olp

2011 Q4 Form 10-K Financial Statement

#000104746913002811 Filed on March 15, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OLP
ONE LIBERTY PROPERTIES INC Stock $olp