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Note 12 - Segment Reporting - Revenue From Operations by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue	$ 116,126	$ 115,108
Operating Segments [Member]
Revenue	116,126	115,108
Operating Segments [Member] | United States Segment [Member]
Revenue	91,053	90,076
Operating Segments [Member] | Europe Segment [Member]
Revenue	21,449	20,787
Operating Segments [Member] | Japan Segment [Member]
Revenue	$ 3,624	$ 4,245

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

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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