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Note 12 - Share-Based Payments (Details) - Stock Option Transactions (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Stock Option Transactions [Abstract]        
Outstanding, beginning of period 1,107,257 2,168,003 1,407,639 2,148,170
Outstanding, beginning of period $ 3.97 $ 2.60 $ 3.80 $ 2.60
Granted   82,876   120,376
Granted   $ 8.56   $ 8.56
Exercised (48,108) (129,929) (340,021) (144,143)
Exercised $ 2.72 $ 2.16 $ 3.06 $ 2.16
Forfeited (6,091) (3,829) (11,685) (7,282)
Forfeited $ 5.71 $ 5.28 $ 5.64 $ 5.28
Expired (750)   (3,625)  
Expired $ 3.20   $ 3.36  
Outstanding, end of period 1,052,308 2,117,121 1,052,308 2,117,121
Outstanding, end of period $ 4.01 $ 2.84 $ 4.01 $ 2.84
Options exercisable, end of period 824,641 1,741,361 824,641 1,741,361
Options exercisable, end of period $ 3.34 $ 2.40 $ 3.34 $ 2.40