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Note 14 - Stock Awards - Stock Option Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Outstanding, beginning of year (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) 21,816 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 0
Forfeited, average exercise price (in dollars per share) $ 11.79 $ 0
Options outstanding, end of year (in shares) 318,000 272,550
Options outstanding, end of period, average exercise price (in dollars per share) $ 9.43 $ 8.21
Options exercisable, end of year (in shares) 206,133 175,550
Options exercisable, end of period, average exercise price (in dollars per share) $ 8.20 $ 8.17