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Note 2 - Cost of Sales (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Statement Line Items [Line Items] |  |  |  |
Total current inventories | $ 2,524,341 | $ 2,368,304 | $ 1,563,889 | $ 1,843,467
Discontinued operations [member] |  |  |  |
Statement Line Items [Line Items] |  |  |  |
Total current inventories |  |  | $ 29,800 |

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