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Note 9 - Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2016
Phantom Share Units (PSUs) [Member]  
Notes Tables  
Schedule of Share-based Compensation, Activity [Table Text Block]
Phantom Stock Plan   Shares   Fair Value
         
Outstanding at December 31, 2015     79,440     $ 21.64  
Granted     11,543       20.09  
Forfeited     -       -  
Distributions     (1,364 )     20.28  
Outstanding at September 30, 2016     89,619     $ 23.72  
Vested at September 30, 2016     89,435     $ 23.72  
Non Full Value Awards [Member]  
Notes Tables  
Schedule of Share-based Compensation, Activity [Table Text Block]
    Shares   Weighted-
Average
Exercise
Price
  Weighted-Average
Remaining
Contractual
Term
  Aggregate
Intrinsic
Value
($000)*
                 
Outstanding at December 31, 2015     109,130     $ 16.14                  
Granted     -       -                  
Exercised     (41,670 )     17.82                  
Forfeited     -       -                  
Outstanding at September 30, 2016     67,460     $ 15.10       1.7     $ 582  
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, 2015     415,909     $ 18.10  
Granted     337,175       19.85  
Vested     (235,535 )     18.70  
Forfeited     (17,010 )     18.50  
Non-vested at September 30, 2016     500,539     $ 18.98  
                 
Vested but unissued at September 30, 2016     280,450     $ 19.28  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
    For the three months ended
September 30,
  For the nine months ended
September 30,
(In thousands)   2016   2015   2016   2015
Proceeds from stock options exercised   $ 5     $ -     $ 132     $ 142  
Fair value of shares received upon exercise of stock options     262       421       612       441  
Tax benefit (expense) related to stock options exercised     (10 )     87       (12 )     324  
Intrinsic value of stock options exercised     44       291       156       96