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Note 18 - Segment Reporting - Revenue From Operations by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Revenue	$ 445,596	$ 344,490	$ 298,055
Operating Segments [Member] | United States Segment [Member]
Revenue:
Revenue	350,535	263,086	223,930
Operating Segments [Member] | Europe Segment [Member]
Revenue:
Revenue	80,889	70,154	63,365
Operating Segments [Member] | Japan Segment [Member]
Revenue:
Revenue	$ 14,172	$ 11,250	$ 10,760

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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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