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Note 5 - Components of Working Capital Accounts
 12 Months Ended
Dec. 31, 2018
Notes to Financial Statements  
Supplemental Balance Sheet Disclosures [Text Block]
5.
Components of working capital accounts
 
    December 31,
2018		     December 31,
2017		  
             
Inventories            
Work-in-progress   $
26,534
     $
18,545
  
Finished goods    
11,843
      
9,964
  
Supplies and other    
9,850
      
9,447
  
                 
    $
48,227
     $
37,956
  
                 
Accrued liabilities                
Accrued payroll and benefits   $
73,454
     $
65,967
  
Value appreciation plans    
8,860
      
2,883
  
Customer advances    
1,365
      
1,468
  
Other    
48,893
      
47,872
  
                 
    $
132,572
     $
118,190