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Note 12 - Segment Reporting - Revenue from Operations by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue:
Revenue	$ 107,745	$ 80,167
Operating Segments [Member] | United States Segment [Member]
Revenue:
Revenue	84,167	60,176
Operating Segments [Member] | Europe Segment [Member]
Revenue:
Revenue	19,945	16,999
Operating Segments [Member] | Japan Segment [Member]
Revenue:
Revenue	$ 3,633	$ 2,992

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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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