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Note 8 - Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 2015
Note 8 - 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
    314,520       19.10  
Vested
    (218,220 )     17.30  
Forfeited
    (2,900 )     17.53  
Non-vested at March 31, 2015
    466,554     $ 18.07  
Vested but unissued at March 31, 2015
    247,946     $ 18.14  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
   
For the three months ended
March 31,
 
(In thousands)
 
2015
   
2014
 
Proceeds from stock options exercised
  $ -     $ 343  
Fair value of shares received upon exercised of stock options
    20       478  
Tax benefit related to stock options exercised
    1       69  
Intrinsic value of stock options exercised
    2       212  
Non-Full Value Awards [Member]  
Note 8 - Stock-based Compensation (Tables) [Line Items]  
Schedule of Share-based Compensation, Activity [Table Text Block]
   
Shares
   
Weighted-
Average
Exercise
Price
 
WeightedAverage
Contractual
Remaining
Term
 
Aggregate
Intrinsic
Value
$(000) *
 
Outstanding at December 31, 2014
    154,915     $ 15.19            
Granted
    -       -            
Exercised
    (1,100 )     17.88            
Forfeited
    -       -            
Outstanding at March 31, 2015
    153,815     $ 15.17  
3.0
  $ 754  
Phantom Share Units (PSUs) [Member]  
Note 8 - 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
    11,156       19.16  
Forfeited
    -       -  
Distributions
    (395 )     19.51  
Outstanding at March 31, 2015
    77,874     $ 20.07  
Vested at March 31, 2015
    77,501     $ 20.07