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Note 9 - Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Note 9 - 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     (258,700 )     17.37  
Forfeited     (7,320 )     18.42  
Non-vested at June 30, 2015     425,254     $ 18.10  
                 
Vested but unissued at June 30, 2015     288,426     $ 18.08  
 
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]  
   

For the three months ended

June 30,

 

For the six months ended

June 30,

(In thousands)   2015   2014   2015   2014
Proceeds from stock options exercised   $ 142     $ 87     $ 142     $ 429  
Fair value of shares received upon exercised of stock options     -       812       20       1,290  
Tax benefit related to stock options exercised     8       24       9       93  
Intrinsic value of stock options exercised     31       105       33       317  
Non-Full Value Awards [Member]    
Note 9 - Stock-based Compensation (Tables) [Line Items]    
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, 2014     154,915     $ 15.19                  
Granted     -       -                  
Exercised     (9,725 )     16.65                  
Forfeited     -       -                  
Outstanding at June 30, 2015     145,190     $ 15.09       3.1     $ 860  
 
Phantom Share Units (PSUs) [Member]    
Note 9 - 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     11,729       19.28  
Forfeited     (2 )     20.58  
Distributions     (451 )     19.64  
Outstanding at June 30, 2015     78,389     $ 21.01  
Vested at June 30, 2015     78,119     $ 21.01