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Note 11 - Stock-Based Compensation (Details) - Full Value Awards
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Full Value Awards [Abstract]  
Shares | shares 373,154
Weighted-Average Grant-Date Fair Value | $ / shares $ 16.75
Vested but unissued at December 31, 2015 | shares 290,226
Vested but unissued at December 31, 2015 | $ / shares $ 18.08
Granted | shares 318,120
Granted | $ / shares $ 19.10
Vested | shares (260,700)
Vested | $ / shares $ 17.36
Forfeited | shares (14,665)
Forfeited | $ / shares $ 18.39
Shares | shares 415,909
Weighted-Average Grant-Date Fair Value | $ / shares $ 18.10