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Note 11 - Segment Reporting - Revenue From Operations by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue	$ 106,575	$ 115,932	$ 221,683	$ 229,384
Operating Segments [Member]
Revenue	106,575	115,932	221,683	229,384
Operating Segments [Member] | United States Segment [Member]
Revenue	86,823	91,149	176,899	178,960
Operating Segments [Member] | Europe Segment [Member]
Revenue	16,729	20,940	37,516	42,194
Operating Segments [Member] | Japan Segment [Member]
Revenue	$ 3,023	$ 3,843	$ 7,268	$ 8,230

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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