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Note 11 - Segment Reporting - Revenue to External Customers and Long-lived Assets by Geography (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues	$ 82,040	$ 74,961	$ 162,207	$ 147,529
Operating Segments [Member] \| United States Segment [Member]
Revenues	63,353	55,323	123,529	109,791
Operating Segments [Member] \| Europe Segment [Member]
Revenues	16,131	17,276	33,130	32,907
Operating Segments [Member] \| Japan Segment [Member]
Revenues	$ 2,556	$ 2,362	$ 5,548	$ 4,831