Note 16 - Geographic Revenue and Long-lived Assets Distribution - Revenue and Long-lived Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue by geographic area	$ 86,078	$ 62,782	$ 49,505
Long-lived assets by geographic area	7,793	6,284
UNITED STATES
Revenue by geographic area	49,462	31,362	22,537
Long-lived assets by geographic area	6,625	5,051
UNITED KINGDOM
Revenue by geographic area	2,620	2,836	2,971
Long-lived assets by geographic area	922	954
Europe and ROW, Excluding U.K. [Member]
Revenue by geographic area	4,368	4,231	4,248
Long-lived assets by geographic area	139	170
European Union [Member]
Revenue by geographic area	6,988	7,067	7,219
Long-lived assets by geographic area	1,061	1,124
Asia [Member]
Revenue by geographic area	29,628	24,353	$ 19,749
Long-lived assets by geographic area	$ 107	$ 109