Note 15 - Segment and Geographic Information - Total Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Total Revenue	$ 23,386	$ 22,283
Percentage of Revenue	100.00%	100.00%
UNITED STATES
Total Revenue	$ 18,930	$ 18,011
Percentage of Revenue	81.00%	81.00%
Europe [Member]
Total Revenue	$ 2,829	$ 2,565
Percentage of Revenue	12.00%	11.00%
Other Location [Member]
Total Revenue	$ 1,627	$ 1,707
Percentage of Revenue	7.00%	8.00%