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Note 9 - Stock-based Compensation (Details) - Full Value Awards - Jun. 30, 2015 - $ / shares
Total
Full Value Awards [Abstract]  
Shares 373,154
Weighted-Average Grant-Date Fair Value $ 16.75
Vested but unissued at June 30, 2015 288,426
Vested but unissued at June 30, 2015 $ 18.08
Granted 318,120
Granted $ 19.10
Vested (258,700)
Vested $ 17.37
Forfeited (7,320)
Forfeited $ 18.42
Shares 425,254
Weighted-Average Grant-Date Fair Value $ 18.10