XML 76 R61.htm IDEA: XBRL DOCUMENT
v3.8.0.1

COMMITMENTS AND CONTINGENCIES (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2018 USD ($)
Pension expense | $ 275,000 | $ 273,000 | $ 266,000 |
Annual fixed leasehold rent for next five years | 371,094 |  |  |
Annual fixed leasehold rent thereafter through March 3, 2020 | $ 463,867 |  |  |
Number of 5-year extension options | item | 5 |  |  |
Lease extension period for the first five renewal options | 5 years |  |  |
Number of seven month extension options | item | 1 |  |  |
Lease extension period for the last renewal option | 7 months |  |  |
Building located In Hauppauge, New York |  |  |  |
Contractual obligation | $ 3,584,000 |  |  | $ 7,800,000
Regal Cinemas In Greensboro, North Carolina |  |  |  |
Contractual obligation | $ 3,000,000 |  |  |

X
- Definition Represents the amount of annual fixed rent required to be paid by the entity for the next five years. + References No definition available. + Details
Name: | olp_OperatingLeasesAnnualFixedRentForNextFiveYears
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the amount of annual fixed rent required to be paid by the entity thereafter through March 3, 2020. + References No definition available. + Details
Name: | olp_OperatingLeasesAnnualFixedRentThereafter
Namespace Prefix: | olp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the period for which the lease may be extended under the first five renewal options. + References No definition available. + Details
Name: | olp_OperatingLeasesExtensionPeriodFirstFiveRenewalOptions
Namespace Prefix: | olp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period for which the lease may be extended under the last renewal option. + References No definition available. + Details
Name: | olp_OperatingLeasesExtensionPeriodLastRenewalOption
Namespace Prefix: | olp_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of five year extension options available to entity. + References No definition available. + Details
Name: | olp_OperatingLeasesNumberOfFiveYearExtensionOptions
Namespace Prefix: | olp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of seven months extension options available to entity. + References No definition available. + Details
Name: | olp_OperatingLeasesNumberOfSevenMonthsExtensionOptions
Namespace Prefix: | olp_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
Name: | us-gaap_PensionExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=olp_BuildingLocatedInHauppaugeNewyorkMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=olp_RegalCinemasInGreensboroNorthCarolinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |