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Note 11 - Business Segments and Significant Customers (Details) - Sales by Geographic Area - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Note 11 - Business Segments and Significant Customers (Details) - Sales by Geographic Area [Line Items] |  |  |
Sales by geographical area | $ 437,372 | $ 499,308 | $ 379,546
UNITED STATES |  |  |
Note 11 - Business Segments and Significant Customers (Details) - Sales by Geographic Area [Line Items] |  |  |
Sales by geographical area | 17,862 | 22,200 | 22,361
CANADA |  |  |
Note 11 - Business Segments and Significant Customers (Details) - Sales by Geographic Area [Line Items] |  |  |
Sales by geographical area | 275,771 | 295,027 | 170,632
JAPAN |  |  |
Note 11 - Business Segments and Significant Customers (Details) - Sales by Geographic Area [Line Items] |  |  |
Sales by geographical area | 38,835 | 58,466 | 50,039
KOREA, REPUBLIC OF |  |  |
Note 11 - Business Segments and Significant Customers (Details) - Sales by Geographic Area [Line Items] |  |  |
Sales by geographical area | 66,293 | 70,548 | 86,035
CHINA |  |  |
Note 11 - Business Segments and Significant Customers (Details) - Sales by Geographic Area [Line Items] |  |  |
Sales by geographical area | $ 38,611 | $ 53,067 | $ 50,479

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