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LEASES - As Lessor - Unbilled Straight-Line Rent (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Unbilled Straight-Line Rent |  |  |
Unbilled rent receivable | $ 15,037,000 | $ 13,722,000 |
Period during which amount of unbilled rent receivable is to be billed and received | 16 years |  |
Unbilled straight-line rent receivables written off related to property sold | $ 182,000 | 45,000 | $ 105,000
Unbilled rent payables | $ 662,000 | 0 |
Period during which amount of unbilled rent payable is to be billed and received | 22 years |  |
Unbilled rent straight-line rent receivable written off related to tenant bankruptcy | $ 548,000 | $ 1,440,000 | $ 362,000

X
- Definition Represents the amount of rent reported on a straight-line basis less than rental payments required under the respective leases. + References No definition available. + Details
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Balance Type: | credit
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X
- Definition Represents the period during which amount of rent is to be billed and received pursuant to the lease terms. + References No definition available. + Details
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Namespace Prefix: | olp_
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X
- Definition Represents the period during which amount of rent is to be billed and received pursuant to the lease terms. + References No definition available. + Details
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Namespace Prefix: | olp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of unbilled rent receivable written off during the period relating to properties sold. + References No definition available. + Details
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Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of unbilled rent receivable written off during the period related to tenant bankruptcy or going concern issues. + References No definition available. + Details
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Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition n/a + References No definition available. + Details
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Namespace Prefix: | olp_
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X
- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property, by the lessor or lessee, respectively. Such receivable is reduced by allowances attributable to, for instance, credit risk associated with a lessee. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77913719&loc=d3e40879-112712 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39927-112707 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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