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Note 10 - Stock Based Compensation (Details) - Stock Incentive Plans Activity - Restricted Stock (Restricted Stock [Member], USD $)
12 Months Ended
Dec. 31, 2013
Restricted Stock [Member]
 
Note 10 - Stock Based Compensation (Details) - Stock Incentive Plans Activity - Restricted Stock [Line Items]  
Balance, December 31, 2012 651,943
Balance, December 31, 2012 (in Dollars per share) $ 13.35
Granted 239,324
Granted (in Dollars per share) $ 43.13
Vested (185,462)
Vested (in Dollars per share) $ 7.97
Forfeited (28,447)
Forfeited (in Dollars per share) $ 19.12
Balance, December 31, 2013 677,358
Balance, December 31, 2013 (in Dollars per share) $ 25.10