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Note 15 - Stock Option Transactions (Details) - $ / shares
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Outstanding, Number of shares (in shares) 513,366 976,062
Outstanding, Weighted average exercise price per share (in dollars per share) $ 9.24 $ 5.41
Granted, Number of shares (in shares) 55,000 45,000
Granted, Weighted average exercise price per share (in dollars per share) $ 20.89 $ 19.41
Exercised, Number of shares (in shares) (11,574) (74,997)
Exercised, Weighted average exercise price per share (in dollars per share) $ 4.63 $ 3.31
Forfeited, Number of shares (in shares) (5,401) (2,742)
Forfeited, Weighted average exercise price per share (in dollars per share) $ 12.24 $ 12.15
Expired, Number of shares (in shares) (750)
Expired, Weighted average exercise price per share (in dollars per share) $ 3.76
Outstanding, Number of shares (in shares) 550,641 943,323
Outstanding, Weighted average exercise price per share (in dollars per share) $ 10.48 $ 6.23
Options exercisable, Number of shares (in shares) 311,594 653,145
Options exercisable, Weighted average exercise price per share (in dollars per share) $ 6.54 $ 4.11