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Note 12 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets, Valuation Allowance, Total	$ 11,364	$ 11,188
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	200
Operating Loss Carryforwards, Total	700
Tax Credit Carryforward, Amount	15,500
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 4,900	$ 4,600	$ 4,200
Open Tax Year	2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
Foreign Tax Authority [Member]
Tax Credit Carryforward, Amount	$ 900

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

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X

- Definition

Tax year that remains open to examination under enacted tax laws, in YYYY format.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

+ References

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

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