INVESTMENTS, AT FAIR VALUE (Details 2) - USD ($)	3 Months Ended		12 Months Ended
INVESTMENTS, AT FAIR VALUE (Details 2) - USD ($)	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Unrealized gain on investment securities, net	$ (1,870,997)	$ (1,460,160)
Liabilities [Member]
Unrealized gain on investment securities, net	(608,731)		$ (619,122)
Liabilities [Member] \| Third Party Call Options [Member]
Unrealized gain on investment securities, net	$ (608,731)		$ (619,122)
Liabilities [Member] \| Cost [Member]
Unrealized gain on investment securities, net
Liabilities [Member] \| Cost [Member] \| Third Party Call Options [Member]
Unrealized gain on investment securities, net
Liabilities [Member] \| Estimate of Fair Value [Member]
Unrealized gain on investment securities, net	$ (608,731)		$ (619,122)
Liabilities [Member] \| Estimate of Fair Value [Member] \| Third Party Call Options [Member]
Unrealized gain on investment securities, net	(608,731)		(619,122)
Assets [Member]
Unrealized gain on investment securities, net	9,997,902		11,878,776
Assets [Member] \| Warrant B [Member]
Unrealized gain on investment securities, net	1,268,937		1,851,750
Assets [Member] \| Common Stock
Unrealized gain on investment securities, net	$ 7,593,552		$ 8,891,613
Assets [Member] \| Real Estate Company Investments [Member]
Unrealized gain on investment securities, net
Assets [Member] \| 2014 Call Options [Member]
Unrealized gain on investment securities, net	$ 1,135,413		$ 1,135,413
Assets [Member] \| Cost [Member]
Unrealized gain on investment securities, net	$ 1,282,428		$ 1,282,942
Assets [Member] \| Cost [Member] \| Warrant B [Member]
Unrealized gain on investment securities, net
Assets [Member] \| Cost [Member] \| Common Stock
Unrealized gain on investment securities, net	$ 1,004,478		$ 1,004,992
Assets [Member] \| Cost [Member] \| Real Estate Company Investments [Member]
Unrealized gain on investment securities, net	277,500		277,500
Assets [Member] \| Cost [Member] \| 2014 Call Options [Member]
Unrealized gain on investment securities, net	450		450
Assets [Member] \| Estimate of Fair Value [Member]
Unrealized gain on investment securities, net	11,280,329		13,161,718
Assets [Member] \| Estimate of Fair Value [Member] \| Warrant B [Member]
Unrealized gain on investment securities, net	1,268,937		1,851,750
Assets [Member] \| Estimate of Fair Value [Member] \| Common Stock
Unrealized gain on investment securities, net	8,598,030		9,896,605
Assets [Member] \| Estimate of Fair Value [Member] \| Real Estate Company Investments [Member]
Unrealized gain on investment securities, net	277,500		277,500
Assets [Member] \| Estimate of Fair Value [Member] \| 2014 Call Options [Member]
Unrealized gain on investment securities, net	$ 1,135,863		$ 1,135,863

CAPSTONE FINANCIAL GROUP, INC. 10-Q