CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Mortgage Backed Securities At Fair Value [Abstract]
Pledged to counterparties	$ 204,728,276	$ 209,269,791
Unpledged	100,670	422,341
Total mortgage-backed securities	204,828,946	209,692,132
Cash and cash equivalents	4,976,440	6,103,250
Restricted cash	908,530	2,649,610
Orchid Island Capital, Inc. common stock, at fair value	11,202,665	14,105,934
Retained interests in securitizations	271,738	653,380
Accrued interest receivable	739,221	746,121
Property and equipment, net	3,355,256	3,359,312
Deferred tax assets, net	45,421,066	44,524,584
Other assets	3,265,193	2,754,474
Total Assets	274,969,055	284,588,797
Liabilities
Outstanding repurchase obligations	193,819,649	200,182,751
Junior subordinated notes due to Bimini Capital Trust II	26,804,440	26,804,440
Accrued interest payable	178,976	346,444
Other Liabilities	1,544,642	1,562,914
Total Liabilities	222,347,707	228,896,549
Stockholders' Equity
Preferred stock	0	0
Common stock	12,808	12,725
Additional paid in capital	335,081,562	334,878,779
Accumulated deficit	(282,473,022)	(279,199,256)
Stockholders Equity	52,621,348	55,692,248
Total Liabilities and Stockholders' Equity	274,969,055	284,588,797
Class A Common Stock [Member]
Stockholders' Equity
Common stock	12,744	12,661
Class B Common Stock [Member]
Stockholders' Equity
Common stock	32	32
Class C Common Stock [Member]
Stockholders' Equity
Common stock	32	32
Residential Mortgage Backed Securities [Member]
Mortgage Backed Securities At Fair Value [Abstract]
Pledged to counterparties	204,728,276	209,269,791
Unpledged	100,670	422,341
Total mortgage-backed securities	$ 204,828,946	$ 209,692,132

No definition available.

Name:	bmnm_MortgageBackedSecuritiesAtFairValueAbstract
Namespace Prefix:	bmnm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.