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ASSET HELD FOR SALE (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Sep. 30, 2020
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Asset Held For Sale [Abstract] |  |
Asset held for sale | $ 699 | $ 699

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- Definition Asset Held For Sale + References No definition available. + Details
Name: | brn_AssetHeldForSaleAbstract
Namespace Prefix: | brn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121558832&loc=d3e400-110220 + Details
Name: | us-gaap_AssetsHeldForSaleNotPartOfDisposalGroupCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant