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Note 9 - Stock-Based Compensation (Details) - Unvested Restricted Stock Award Grants (USD $)
1 Months Ended 9 Months Ended
Mar. 31, 2014
Feb. 28, 2014
Sep. 30, 2014
Sep. 30, 2013
Note 9 - Stock-Based Compensation (Details) - Unvested Restricted Stock Award Grants [Line Items]        
Issued     $ 32.77 $ 20.03
Restricted Stock [Member]
       
Note 9 - Stock-Based Compensation (Details) - Unvested Restricted Stock Award Grants [Line Items]        
Unvested at Beginning     614,580 348,350
Unvested at Beginning     $ 18.71 $ 13.79
Issued 20,760 58,187 78,947 424,450
Issued     $ 33.24 $ 20.64
Forfeited     (8,250) (933)
Forfeited     $ 25.28 $ 15.68
Vested     (184,921) (156,902)
Vested     $ 17.54 $ 13.04
Unvested at End     500,356 614,965
Unvested at End     $ 21.33 $ 18.71