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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Sales by geographical area | $ 708,253 | $ 674,549 | $ 559,053
UNITED STATES |  |  |
Sales by geographical area | 292,704 | 53,612 | 48,437
CANADA |  |  |
Sales by geographical area | 145,670 | 379,095 | 322,402
JAPAN |  |  |
Sales by geographical area | 39,418 | 48,841 | 42,885
NETHERLANDS |  |  |
Sales by geographical area | (923) | 38,420 | 0
KOREA, REPUBLIC OF |  |  |
Sales by geographical area | 165,302 | 154,581 | 145,263
CHINA |  |  |
Sales by geographical area | $ 66,082 | $ 0 | $ 66

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