General form of registration statement for all companies including face-amount certificate companies

Stockholders' Equity (Details 4)

v3.5.0.2
Stockholders' Equity (Details 4) - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]      
Balance at beginning 119,067 117,895 75,348
Granted 7,500 61,912 82,112
Forfeited   (2,562) (1,160)
Vested   (58,178) (38,405)
Balance at ending   119,067 117,895
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Balance at beginning $ 18.80 $ 20.80 $ 22.40
Granted   18.80 25.20
Forfeited   23.60 30.40
Vested   21.20 23.20
Balance at ending   $ 18.80 $ 20.80