Dividends Payable (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)
Dividends Payable
Preferred stock dividends accrued during the period	$ 35,000	$ 34,000
Accrued and unpaid dividends	195,000	$ 160,000
Series 1
Dividends Payable
Preferred stock dividends accrued during the period	$ 12,000
Dividend rate (as a percent)	5.00%
Series 2
Dividends Payable
Preferred stock dividends accrued during the period	$ 15,000
Dividend rate (as a percent)	5.00%
Series 3
Dividends Payable
Preferred stock dividends accrued during the period	$ 8,000
Dividend rate (as a percent)	5.00%
Series 2 preferred stock and Series 3 preferred stock
Dividends Payable
Percentage of additional late fee penalty payable on unpaid dividends	18.00%
Number of outside board members invested in preferred stock | item	1
Period within which entity must cure breach	45 days
Aggregate redemption price	$ 2,000,000