Note 15 - Total Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
UNITED STATES
Total Revenue	$ 21,126	$ 19,239	$ 61,032	$ 51,048
Percentage of Revenue	82.00%	81.00%	82.00%	82.00%
Europe [Member]
Total Revenue	$ 2,703	$ 1,977	$ 8,240	$ 6,294
Percentage of Revenue	10.00%	8.00%	11.00%	10.00%
Other Location [Member]
Total Revenue	$ 1,960	$ 2,465	$ 5,381	$ 4,763
Percentage of Revenue	8.00%	11.00%	7.00%	8.00%
Total Revenue	$ 25,789	$ 23,681	$ 74,653	$ 62,105
Percentage of Revenue	100.00%	100.00%	100.00%	100.00%