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Note 9 - 401(k) Profit Sharing, Deferred Compensation and Long-term Incentive Plans (Tables)
12 Months Ended
Dec. 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]
Year Ended December 31,
 
2016
 
 
2015
 
 
2014
 
Compensation expense
  $
1,081
    $
1,812
    $
1,877
 
Total discretionary contribution
  $
1,785
    $
2,249
    $
2,450
 
Guaranteed annual return
   
5.25
%
   
5.25
%
   
5.25
%