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Note 14 - Stock Option Transactions (Details) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Outstanding, Number of shares (in shares) 550,641 943,323 513,366 976,062
Outstanding, Weighted average exercise price per share (in dollars per share) $ 10.48 $ 6.23 $ 9.24 $ 6.23
Granted, Number of shares (in shares) 8,000 63,000 45,000
Granted, Weighted average exercise price per share (in dollars per share) $ 23.37 $ 21.21 $ 19.41
Exercised, Number of shares (in shares) (51,963) (112,656) (63,537) (187,653)
Exercised, Weighted average exercise price per share (in dollars per share) $ 3.52 $ 2.66 $ 3.72 $ 2.92
Forfeited, Number of shares (in shares) (4,088) (1,716) (9,489) (4,458)
Forfeited, Weighted average exercise price per share (in dollars per share) $ 23.83 $ 13.15 $ 17.23 $ 12.46
Expired, Number of shares (in shares) (1,875) (750) (1,875)
Expired, Weighted average exercise price per share (in dollars per share) $ 2.40 $ 3.76 $ 2.40
Outstanding, Number of shares (in shares) 502,590 827,076 502,590 827,076
Outstanding, Weighted average exercise price per share (in dollars per share) $ 11.30 $ 6.69 $ 11.30 $ 6.69
Options exercisable, Number of shares (in shares) 298,343 581,433 298,343 581,433
Options exercisable, Weighted average exercise price per share (in dollars per share) $ 7.08 $ 4.58 $ 7.08 $ 4.58