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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, 2018 | Mar. 31, 2017
Sales by geographical area | $ 139,094 | $ 146,637
CANADA |  |
Sales by geographical area | 88,668 | 100,219
KOREA, REPUBLIC OF |  |
Sales by geographical area | 32,703 | 28,971
JAPAN |  |
Sales by geographical area | 13,773 | 12,290
UNITED STATES |  |
Sales by geographical area | 4,081 | 5,205
Other Geographic Areas [Member] |  |
Sales by geographical area | $ (131) | $ (48)

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