Annual report pursuant to Section 13 and 15(d)

Stock Options, Stock Grants and New Stock (Stock Options by Exercise Price Range) (Details)

v3.6.0.2
Stock Options, Stock Grants and New Stock (Stock Options by Exercise Price Range) (Details)
 12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding options (shares) | shares 173,048
Number of exercisable options (shares) | shares 129,762
$11.55 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices (dollars per share) $ 11.55
Number of Outstanding options (shares) | shares 82,342
Weighted average exercise price (dollars per share) $ 11.55
Weighted average remaining contractual life in years (years) 4 years 23 days
Number of exercisable options (shares) | shares 82,342
Exercisable options, weighted average exercise price (dollars per share) $ 11.55
$11.35 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices (dollars per share) $ 11.35
Number of Outstanding options (shares) | shares 25,076
Weighted average exercise price (dollars per share) $ 11.35
Weighted average remaining contractual life in years (years) 5 years 35 days
Number of exercisable options (shares) | shares 19,879
Exercisable options, weighted average exercise price (dollars per share) $ 11.35
$13.70 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices (dollars per share) $ 13.70
Number of Outstanding options (shares) | shares 27,801
Weighted average exercise price (dollars per share) $ 13.70
Weighted average remaining contractual life in years (years) 6 years 35 days
Number of exercisable options (shares) | shares 17,141
Exercisable options, weighted average exercise price (dollars per share) $ 13.70
$14.76 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices (dollars per share) $ 14.76
Number of Outstanding options (shares) | shares 9,260
Weighted average exercise price (dollars per share) $ 14.76
Weighted average remaining contractual life in years (years) 7 years 50 days
Number of exercisable options (shares) | shares 3,704
Exercisable options, weighted average exercise price (dollars per share) $ 14.76
$16.01 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices (dollars per share) $ 16.01
Number of Outstanding options (shares) | shares 28,569
Weighted average exercise price (dollars per share) $ 16.01
Weighted average remaining contractual life in years (years) 8 years 40 days
Number of exercisable options (shares) | shares 6,696
Exercisable options, weighted average exercise price (dollars per share) $ 16.01