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Note 6 - Deferred Compensation and Long-term Incentive Plan (Tables)
3 Months Ended
Mar. 31, 2016
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 March 31,
 
 
 
2016
 
 
2015
 
Compensation expense
  $ 280     $ 457  
Discretionary contribution
    1,382       2,096  
Guaranteed annual return
    5.25
%
    5.25
%