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Note 11 - Segment Reporting - Revenue From Operations by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue	$ 107,504	$ 117,455	$ 329,187	$ 346,839
Operating Segments [Member]
Revenue	107,504	117,455	329,187	346,839
Operating Segments [Member] | United States Segment [Member]
Revenue	85,608	92,916	262,507	271,877
Operating Segments [Member] | Europe Segment [Member]
Revenue	18,897	20,721	56,413	62,915
Operating Segments [Member] | Japan Segment [Member]
Revenue	$ 2,999	$ 3,818	$ 10,267	$ 12,047

X

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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