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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

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