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INVESTMENTS - INVESTMENT IN LEASEHOLD LAND INTEREST - LOT 4C (Details) a in Thousands | Jun. 30, 2020 a
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Investment in leasehold land interest – Lot 4C |
Investment Holdings [Line Items] |
Area of land (in acres) | 1

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- Definition Area of land held. + References No definition available. + Details
Name: | us-gaap_AreaOfLand
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_InvestmentHoldingsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_InvestmentTypeAxis=brn_LandInterestMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |