XML 26 R32.htm IDEA: XBRL DOCUMENT
v2.4.0.6

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) | 3 Months Ended
--- | ---
Dec. 31, 2012 item
Principles of Consolidation |
Number of 80%-owned joint ventures | 2
Kaupulehu Developments |
Principles of Consolidation |
Ownership interest in subsidiaries (as a percent) | 77.60%
Kaupulehu 2007, LLLP |
Principles of Consolidation |
Ownership interest in subsidiaries (as a percent) | 80.00%
Kaupulehu Investors, LLC |
Principles of Consolidation |
Ownership interest in subsidiaries (as a percent) | 80.00%

X
- Definition Represents the number of joint ventures owned by the entity. + References No definition available. + Details
Name: | brn_NumberOfJointVentures
Namespace Prefix: | brn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | brn_PrinciplesOfConsolidationAbstract
Namespace Prefix: | brn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section H + Details
Name: | us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration