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Note 4 - Components of Working Capital Accounts - Components of Working Capital Accounts (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
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 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