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LEASES - As Lessor - Unbilled Straight-Line Rent (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Unbilled Straight-Line Rent |  |  |
Unbilled rent receivable | $ 16,079,000 | $ 14,330,000 |
Period during which amount of unbilled rent receivable is to be billed and received | 20 years |  |
Unbilled straight-line rent receivables written off related to property sold | $ 519,000 | 1,438,000 | $ 365,000
Unearned Rental Income | $ 756,000 | $ 897,000 |
Period during which amount of unbilled rent payable is to be billed and received | 10 years |  |
Unbilled rent receivable written off of amounts where collectability is less than probable |  |  | $ 1,094,000

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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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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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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- 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
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X
- Definition Represents the amount of unbilled rent receivable written off during the period of amounts where collectability was less than probable. + References No definition available. + Details
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X
- Definition Amount of excess of rental income recognized over rental payment required by lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 25 -Paragraph 11 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123408481&loc=SL77919140-209958 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=123394697&loc=d3e40879-112712 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=123415192&loc=d3e39927-112707 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123415192&loc=d3e39896-112707 + Details
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