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Note 11 - Stock Awards - Stock Option Activity (Details) - $ / shares
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Outstanding, beginning of period (in shares) 272,550 175,550
Outstanding, beginning of period, average exercise price (in dollars per share) $ 8.21 $ 8.17
Granted (in shares) 70,600 97,000
Granted, average exercise price (in dollars per share) $ 13.84 $ 8.30
Exercised (in shares) 19,316 0
Exercised, average exercise price (in dollars per share) $ 8.15 $ 0
Expired (in shares) 0 0
Expired, average exercise price (in dollars per share) $ 0 $ 0
Forfeited (in shares) 3,334
Forfeited, average exercise price (in dollars per share) $ 11.79
Options outstanding, end of period (in shares) 320,500 272,550
Options outstanding, end of period, average exercise price (in dollars per share) $ 9.42 $ 8.21
Options exercisable, end of period (in shares) 208,633 175,550
Options exercisable, end of period, average exercise price (in dollars per share) $ 8.20 $ 8.17