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Note 11 - Business Segments and Significant Customers - Sales by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Sales by geographical area	$ 583,728	$ 660,193	$ 437,372
UNITED STATES
Sales by geographical area	16,776	22,499	17,862
CANADA
Sales by geographical area	358,663	437,621	275,771
JAPAN
Sales by geographical area	58,475	44,158	38,835
KOREA, REPUBLIC OF
Sales by geographical area	80,183	116,687	66,293
CHINA
Sales by geographical area	69,631	35,220	38,611
Other Geographic Areas [Member]
Sales by geographical area		$ 4,008

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Sales revenue goods excluding gain loss on forward contracts.

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