Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Employee and Director Benefits - Summary of Stock Option Activity (Details)

v3.7.0.1
Note 6 - Employee and Director Benefits - Summary of Stock Option Activity (Details) - Employee Stock Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Outstanding (in shares) 2,026,334 2,498,834 2,498,834  
Outstanding, weighted average exercise price (in dollars per share) $ 9 $ 6.66 $ 6.66  
Outstanding, weighted average remaining contractual term (Year) 6 years 73 days 6 years 255 days 6 years 73 days 6 years 109 days
Outstanding, aggregate intrinsic value $ 49,540 $ 32,058 $ 57,636 $ 42,743
Granted (in shares) 51,500 198,000    
Granted, weighted average exercise price (in dollars per share) $ 38.10 $ 19.11    
Granted, weighted average remaining contractual term (Year) 9 years 292 days 9 years 292 days    
Granted, aggregate intrinsic value $ (89)    
Exercised (in shares) (175,500) (411,000)    
Exercised, weighted average exercise price (in dollars per share) $ 5.28 $ 4.27    
Exercised, weighted average remaining contractual term (Year) 5 years 4 years 219 days    
Exercised, aggregate intrinsic value $ 5,459 $ 7,372    
Forfeited (in shares) (27,000) (9,000)    
Forfeited, weighted average exercise price (in dollars per share) $ 21.55 $ 19.52    
Forfeited, weighted average remaining contractual term (Year) 8 years 292 days 9 years 109 days    
Forfeited, aggregate intrinsic value $ 401 $ 24    
Outstanding (in shares) 1,875,334 2,276,834 2,026,334 2,498,834
Outstanding, weighted average exercise price (in dollars per share) $ 9.96 $ 8.12 $ 9 $ 6.66
Exercisable (in shares) 928,236 782,836    
Exercisable, weighted average exercise price (in dollars per share) $ 5.12 $ 4.74    
Exercisable, weighted average remaining contractual term (Year) 4 years 219 days 5 years 73 days    
Exercisable, aggregate intrinsic value $ 29,013 $ 13,672