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Note 11 - Stock Awards - Stock Option Activity (Details) - $ / shares
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Outstanding, beginning of period, Number of Shares (in shares) 272,550 175,550
Outstanding, beginning of period, Average Exercise Price (in dollars per share) $ 8.21 $ 8.17
Stock Options Granted, Number of Shares (in shares) 64,600 97,000
Stock Options Granted, Average Exercise Price (in dollars per share) $ 14.11 $ 8.30
Stock Options Exercised, Number of Shares (in shares) 16,650 0
Stock Options Exercised, Average Exercise Price (in dollars per share) $ 8.15 $ 0
Stock Options Expired, Number of Shares (in shares) 0 0
Stock Options Expired, Average Exercise Price (in dollars per share) $ 0 $ 0
Stock Options Forfeited, Number of Shares (in shares) 0
Stock Options Forfeited, Average Exercise Price (in dollars per share) $ 0
Options outstanding, end of period, Number of Shares (in shares) 320,500 272,550
Options outstanding, end of period, Average Exercise Price (in dollars per share) $ 9.41 $ 8.21
Options exercisable, end of period, Number of Shares (in shares) 210,633 175,550
Options exercisable, end of period, Average Exercise Price (in dollars per share) $ 8.20 $ 8.17