Note 16 - Product Revenue by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
UNITED STATES
Total Revenue	$ 18,011	$ 12,591
Percentage of Revenue	81.00%	81.00%
Europe [Member]
Total Revenue	$ 2,565	$ 1,986
Percentage of Revenue	11.00%	13.00%
Other Location [Member]
Total Revenue	$ 1,707	$ 943
Percentage of Revenue	8.00%	6.00%
Total Revenue	$ 22,283	$ 15,520
Percentage of Revenue	100.00%	100.00%