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Note 4 - Components of Working Capital Accounts (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
    December 31,
2016		   December 31,
2015
         
Inventories        
Work-in-progress   $
15,529
     $
6,465
  
Finished goods    
6,071
      
5,489
  
Supplies and other    
8,112
      
4,201
  
                 
    $
29,712
     $
16,155
  
                 
Accrued liabilities                
Accrued payroll and benefits   $
60,546
     $
45,690
  
Value appreciation plans    
12,467
      
7,110
  
Customer advances    
501
      
243
  
Other    
37,094
      
24,857
  
                 
    $
110,608
     $
77,900