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Note 6 - Business Segments and Sales of Products - Sales by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Sales by geographical area | $ 135,245 | $ 155,093
CANADA |  |
Sales by geographical area | 54,333 | 92,872
KOREA, REPUBLIC OF |  |
Sales by geographical area | 26,607 | 49,300
JAPAN |  |
Sales by geographical area | 6,121 | 8,350
CHINA |  |
Sales by geographical area | 13,921 | 0
UNITED STATES |  |
Sales by geographical area | 35,185 | 4,571
Other Geographic Areas [Member] |  |
Sales by geographical area | $ (922) | $ 0

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