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Note 15 - Share-based Payments (Details) - Stock Option Transactions - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Stock Option Transactions [Abstract]        
Outstanding, beginning of period 827,076 1,052,308 976,062 1,407,639
Outstanding, beginning of period $ 6.69 $ 4.01 $ 6.23 $ 3.80
Outstanding, end of period 804,495 1,007,271 804,495 1,007,271
Outstanding, end of period $ 7.30 $ 5.34 $ 7.30 $ 5.34
Options exercisable, end of period 580,721 732,683 580,721 732,683
Options exercisable, end of period $ 4.85 $ 3.84 $ 4.85 $ 3.84
Granted 22,500 98,100 67,500 98,100
Granted $ 24.96 $ 15.83 $ 21.26 $ 15.83
Exercised (41,404) (134,199) (229,057) (474,220)
Exercised $ 4.59 $ 2.56 $ 3.22 $ 2.92
Forfeited (3,677) (8,938) (8,135) (20,623)
Forfeited $ 9.63 $ 6.15 $ 11.43 $ 5.86
Expired     (1,875) (3,625)
Expired     $ 2.40 $ 3.36