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Note 7 - Business Segments and Sales of Products - Sales by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Sales by geographical area | $ 138,627 | $ 141,465 | $ 422,284 | $ 421,574
CANADA |  |  |  |
Sales by geographical area | 83,723 | 79,834 | 266,915 | 263,268
KOREA, REPUBLIC OF |  |  |  |
Sales by geographical area | 35,796 | 27,396 | 110,036 | 75,339
JAPAN |  |  |  |
Sales by geographical area | 3,301 | 14,419 | 20,971 | 38,513
CHINA |  |  |  |
Sales by geographical area |  | 16,695 | 66 | 32,047
UNITED STATES |  |  |  |
Sales by geographical area | $ 15,807 | $ 3,121 | $ 24,296 | $ 12,407

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