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Note 2 - Significant Accounting Policies (Details) - Earnings Per Share, Basic and Diluted
3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share, Basic and Diluted [Abstract]        
Shares issued – beginning of period 19,787,068us-gaap_CommonStockSharesIssued 18,212,104us-gaap_CommonStockSharesIssued 19,576,619us-gaap_CommonStockSharesIssued 17,673,983us-gaap_CommonStockSharesIssued
Shares held by subsidiaries (Note 8) (704,309)bnet_SharesHeldBySubsidiaries (704,309)bnet_SharesHeldBySubsidiaries (704,309)bnet_SharesHeldBySubsidiaries (704,309)bnet_SharesHeldBySubsidiaries
Shares outstanding – beginning of period 19,082,759us-gaap_CommonStockSharesOutstanding 17,507,795us-gaap_CommonStockSharesOutstanding 18,872,310us-gaap_CommonStockSharesOutstanding 16,969,674us-gaap_CommonStockSharesOutstanding
Weighted average shares for fully vested stock bonuses (Note 9) 840,000bnet_WeightedAverageSharesForFullyVestedStockBonuses 840,000bnet_WeightedAverageSharesForFullyVestedStockBonuses 840,000bnet_WeightedAverageSharesForFullyVestedStockBonuses 840,000bnet_WeightedAverageSharesForFullyVestedStockBonuses
Weighted average shares issued during the period 42,700us-gaap_WeightedAverageNumberOfSharesIssuedBasic 57,434us-gaap_WeightedAverageNumberOfSharesIssuedBasic 178,957us-gaap_WeightedAverageNumberOfSharesIssuedBasic 420,453us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Basic weighted average shares – end of period 19,965,459us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 18,405,229us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 19,891,267us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 18,230,127us-gaap_WeightedAverageNumberOfSharesOutstandingBasic