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Note 11 - Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2015
Note 11 - Stock-Based Compensation (Tables) [Line Items]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]
    Shares   Weighted-Average
Grant-Date
Fair Value
         
Non-vested at December 31, 2014     373,154     $ 16.75  
Granted     318,120       19.10  
Vested     (260,700 )     17.36  
Forfeited     (14,665 )     18.39  
Non-vested at December 31, 2015     415,909     $ 18.10  
                 
Vested but unissued at December 31, 2015     290,226     $ 18.08  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
(In thousands, except grant date fair value)   2015   2014   2013
Proceeds from stock options exercised   $ 145     $ 565     $ 533  
Fair value of shares received upon exercise of stock options     447       1,962       6,814  
Tax benefit related to stock options exercised     99       88       151  
Intrinsic value of stock options exercised     330       488       1,228  
                         
Weighted average fair value on grant date      n/a         n/a         n/a   
Non-Full Value Awards [Member]  
Note 11 - Stock-Based Compensation (Tables) [Line Items]  
Schedule of Share-based Compensation, Activity [Table Text Block]
    Shares   Weighted-
Average
Exercise
Price
  Weighted-Average
Remaining
Contractual
(years)
  Aggregate
Intrinsic
Value
($000)*
                 
Outstanding at December 31, 2014     154,915     $ 15.19                  
Granted     -       -                  
Exercised     (45,785 )     12.92                  
Forfeited     -       -                  
Outstanding at December 31, 2015     109,130     $ 16.14       2.3     $ 600  
Exercisable shares at December 31, 2015     109,130     $ 16.14       2.3     $ 600  
Phantom Share Units (PSUs) [Member]  
Note 11 - Stock-Based Compensation (Tables) [Line Items]  
Schedule of Share-based Compensation, Activity [Table Text Block]
Phantom Stock Plan   Shares   Fair Value
                 
Outstanding at December 31, 2014     67,113     $ 20.27  
Granted     12,924       19.44  
Forfeited     (3 )     20.78  
Distributions     (594 )     19.82  
Outstanding at December 31, 2015     79,440     $ 21.64  
Vested at December 31, 2015     78,857     $ 21.64