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Note 6 - Deferred Compensation and Long-Term Incentive Plan (Tables)
6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits by Title of Individual and Type of Deferred Compensation [Table Text Block]
   

Three Months Ended

June 30,

   

Six Months Ended

June 30,

 
   

2015

   

2014

   

2015

   

2014

 

Compensation expense

  $ 463     $ 377     $ 920     $ 1,077  

Discretionary contribution

  $ 153     $ -     $ 2,249     $ 2,100  

Guaranteed annual return

    5.25 %     5.25 %     5.25 %     5.25 %