Note 12 - Segment Reporting - Revenue From Operations by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue	$ 125,342	$ 107,504	$ 364,516	$ 329,187
Operating Segments [Member]
Revenue	125,342	107,504	364,516	329,187
Operating Segments [Member] \| United States Segment [Member]
Revenue	100,127	85,608	286,524	262,507
Operating Segments [Member] \| Europe Segment [Member]
Revenue	22,155	18,897	68,259	56,413
Operating Segments [Member] \| Japan Segment [Member]
Revenue	$ 3,060	$ 2,999	$ 9,733	$ 10,267

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.

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+ Details