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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Sales by geographical area | $ 583,728 | $ 660,193 | $ 437,372
UNITED STATES |  |  |
Sales by geographical area | 16,776 | 22,499 | 17,862
CANADA |  |  |
Sales by geographical area | 358,663 | 437,621 | 275,771
JAPAN |  |  |
Sales by geographical area | 58,475 | 44,158 | 38,835
KOREA, REPUBLIC OF |  |  |
Sales by geographical area | 80,183 | 116,687 | 66,293
CHINA |  |  |
Sales by geographical area | 69,631 | 35,220 | 38,611
Other Geographic Areas [Member] |  |  |
Sales by geographical area |  | $ 4,008 |

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