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Note 12 - Business Segments, Sales of Products and Significant Customers - Sales by Geographic Area (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Sales by geographical area | $ 559,053 | $ 583,758 | $ 660,193
UNITED STATES |  |  |
Sales by geographical area | 48,437 | 16,806 | 22,499
CANADA |  |  |
Sales by geographical area | 322,402 | 358,663 | 437,621
JAPAN |  |  |
Sales by geographical area | 42,885 | 58,475 | 44,158
KOREA, REPUBLIC OF |  |  |
Sales by geographical area | 145,263 | 80,183 | 116,687
CHINA |  |  |
Sales by geographical area | 66 | 69,631 | 35,220
Other Geographic Areas [Member] |  |  |
Sales by geographical area |  |  | $ 4,008

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