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Note 15 - Income Taxes - Significant Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 17,808	$ 15,119	$ 15,845
State	1,367	1,091	1,074
Foreign	2,215	2,439	1,591
Deferred
Federal	865	2,758	2,798
State	193	75	(38)
Foreign	(1,918)	(1,960)	294
Valuation Allowance	2,127	1,992	(217)
Total	$ 22,657	$ 21,514	$ 21,347

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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