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Note 1 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Deferred Compensation Plan [Table Text Block]
   
December 31,
  
   
2018
    
2017
  
Deferred compensation plan asset components:
                
Cash surrender value of corporate-owned life insurance policies
   $
13,103
     $
11,455
  
Fair value of mutual funds and money market funds
    
18,867
      
16,625
  
Total
   $
31,970
     $
28,080
  
                 
Deferred compensation plan assets reported in:
                
Other long-term assets
   $
31,970
     $
28,080
  
                 
Deferred compensation plan liabilities reported in:
                
Accrued compensation and related benefits (short-term)
   $
447
     $
356
  
Other long-term liabilities
    
32,283
      
28,087
  
Total
   $
32,730
     $
28,443