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Note 4 - Components of Working Capital Accounts
12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Supplemental Balance Sheet Disclosures [Text Block]
4.
Components of working capital accounts
 
   
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