Stock-Based Compensation (Stock Option Activities) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of shares
Beginning Balance	5,000	27,500
Options granted	0	0
Options exercised	0	0
Options expired	0	(22,500)
Ending Balance	5,000	5,000	27,500
Weighted Average Exercise Price per Share
Beginning Balance	$ 10.3	$ 12.92
Options granted	0	0
Options exercised	0	0
Options expired	0	(2.62)
Ending Balance	10.3	10.3	$ 12.92
Weighted Average Fair Value at Grant Date
Options granted	$ 0	$ 0
Weighted Average Remaining Contractual Life
Weighted Average Remaining Contractual Life	3 months 18 days	3 months 18 days	3 months 18 days
Intrinsic Value
Beginning Balance	$ 0	$ 0
Options granted	0	0
Options exercised	0	0
Options expired	0	0
Ending Balance	$ 0	$ 0	$ 0