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Note 11 - Business Segments and Significant Customers - Sales by Geographic Area (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Sales by geographical area | $ 660,193 | $ 437,372 | $ 499,308
UNITED STATES |  |  |
Sales by geographical area | 22,499 | 17,862 | 22,200
CANADA |  |  |
Sales by geographical area | 437,621 | 275,771 | 295,027
JAPAN |  |  |
Sales by geographical area | 44,158 | 38,835 | 58,466
KOREA, REPUBLIC OF |  |  |
Sales by geographical area | 116,687 | 66,293 | 70,548
CHINA |  |  |
Sales by geographical area | 35,220 | 38,611 | 53,067
Other Geographic Areas [Member] |  |  |
Sales by geographical area | $ 4,008 |  |

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