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Note 6 - Deferred Compensation and Long-Term Incentive Plan (Tables)
9 Months Ended
Sep. 30, 2015
Notes Tables  
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
September 30,
 
 
Nine Months Ended
September 30,
 
 
 
2015
 
 
2014
 
 
2015
 
 
2014
 
Compensation expense
  $ 450     $ 381     $ 1,369     $ 1,458  
Discretionary contribution
    -       350       2,249       2,450  
Guaranteed annual return
    5.25 %     5.25 %     5.25 %     5.25 %