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Note 6 - Business Segments and Sales of Products - Sales by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Sales by geographical area | $ 160,484 | $ 138,627 | $ 448,458 | $ 422,284
CANADA |  |  |  |
Sales by geographical area | 88,610 | 83,723 | 258,708 | 266,915
KOREA, REPUBLIC OF |  |  |  |
Sales by geographical area | 33,683 | 35,796 | 109,184 | 110,036
JAPAN |  |  |  |
Sales by geographical area | 17,339 | 3,301 | 34,924 | 20,971
NETHERLANDS |  |  |  |
Sales by geographical area | 445 | 0 | 16,500 | 0
CHINA |  |  |  |
Sales by geographical area | 0 | 0 | 0 | 66
UNITED STATES |  |  |  |
Sales by geographical area | $ 20,407 | $ 15,807 | $ 29,142 | $ 24,296

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