Note 18 - Geographic Revenue and Long-lived Assets Distribution - Revenue and Long-lived Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue by geographic area	$ 73,710	$ 59,753
Long-lived assets by geographic area	7,095	7,144
UNITED STATES
Revenue by geographic area	24,177	16,442
Long-lived assets by geographic area	1,365	1,685
UNITED KINGDOM
Revenue by geographic area	4,363	3,626
Long-lived assets by geographic area	5,518	5,248
Europe and ROW, Excluding U.K. [Member]
Revenue by geographic area	6,058	5,527
Long-lived assets by geographic area	74	101
European Union [Member]
Revenue by geographic area	10,421	9,153
Long-lived assets by geographic area	5,592	5,349
Asia [Member]
Revenue by geographic area	39,112	34,158
Long-lived assets by geographic area	$ 138	$ 110