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Note 8 - Restricted Stock Unit Activity (Details) - $ / shares
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Restricted Stock Units (RSUs) [Member]    
Converted into shares (in shares) (2,437)  
Converted into shares (in dollars per share) $ 18.87  
Forfeited (in shares)  
Forfeited (in dollars per share)  
Vested at September 30, 2015 (in shares) 284,988  
Vested at September 30, 2015 (in dollars per share) $ 22.56  
Outstanding at December 31, 2014 (in shares) 305,357 238,023
Outstanding at December 31, 2014 (in dollars per share) $ 22.61 $ 25.11
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 69,771  
Granted (in dollars per share) $ 14.54