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Note 9 - Stock-based Compensation (Details) - Full Value Awards - $ / shares
9 Months Ended
Sep. 30, 2015
Full Value Awards [Abstract]  
Shares 373,154
Weighted-Average Grant-Date Fair Value $ 16.75
Vested but unissued at September 30, 2015 290,226
Vested but unissued at September 30, 2015 $ 18.08
Granted 318,120
Granted $ 19.10
Vested (260,700)
Vested $ 17.37
Forfeited (9,625)
Forfeited $ 18.55
Shares 420,949
Weighted-Average Grant-Date Fair Value $ 18.10