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Earnings Per Share (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Class A Common Stock [Member]    
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]    
Net Income (Loss) Available to Common Stockholders, Basic $ 7,725,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
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$ (2,323,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Net Income (Loss) Available to Common Stockholders, Diluted 7,725,000us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
(2,323,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
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= us-gaap_CommonClassAMember
Weighted Average Number of Shares Outstanding, Diluted [Abstract]    
Common Shares Outstanding 12,324,391us-gaap_CommonStockSharesOutstanding
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= us-gaap_CommonClassAMember
11,509,756us-gaap_CommonStockSharesOutstanding
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Unvested Dividend Eligible Shares Outstanding at the Balance Sheet Date 32,000bmnm_IncentivePlanSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
0bmnm_IncentivePlanSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Effect of Weighting (158,000)bmnm_EffectOfWeighting
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(544,000)bmnm_EffectOfWeighting
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Weighted Average Shares - Basic 12,198,187us-gaap_WeightedAverageNumberOfSharesIssuedBasic
/ us-gaap_StatementClassOfStockAxis
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10,966,076us-gaap_WeightedAverageNumberOfSharesIssuedBasic
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Weighted Average Shares - Diluted 12,198,187us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
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10,966,076us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
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= us-gaap_CommonClassAMember
Income (Loss) Per Share - Basic $ 0.63us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ (0.21)us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Income (Loss) Pe Share - Diluted $ 0.63us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ (0.21)us-gaap_EarningsPerShareDiluted
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Class B Common Stock [Member]    
Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]    
Net Income (Loss) Available to Common Stockholders, Basic 20,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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(7,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
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Net Income (Loss) Available to Common Stockholders, Diluted $ 20,000us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ (7,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
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Weighted Average Number of Shares Outstanding, Diluted [Abstract]    
Common Shares Outstanding 31,938us-gaap_CommonStockSharesOutstanding
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31,938us-gaap_CommonStockSharesOutstanding
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Weighted Average Shares - Basic 31,938us-gaap_WeightedAverageNumberOfSharesIssuedBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
31,938us-gaap_WeightedAverageNumberOfSharesIssuedBasic
/ us-gaap_StatementClassOfStockAxis
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Weighted Average Shares - Diluted 31,938us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
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31,938us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Income (Loss) Per Share - Basic $ 0.63us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ (0.21)us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Income (Loss) Pe Share - Diluted $ 0.63us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ (0.21)us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember