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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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Sales revenue goods excluding gain loss on forward contracts.

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