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Note 6 - Deferred Compensation and Long-Term Incentive Plan (Tables)
3 Months Ended
Mar. 31, 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

March 31,

 
   

2015

   

2014

 

Compensation expense

  $ 457     $ 700  

Discretionary contribution

  $ 2,096     $ 2,100  

Guaranteed annual return

    5.25 %     5.25 %