Note 12 - Segment and Geographic Information (Details) - Product Revenue by Geographic Location (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Geographic Location:
Total Revenue	$ 26,274,660	$ 20,828,377	$ 60,284,947	$ 36,075,388
Percentage of Revenue	100.00%	100.00%	100.00%	100.00%
United States [Member]
Geographic Location:
Total Revenue	22,946,738	15,482,068	54,480,556	27,765,515
Percentage of Revenue	87.00%	74.00%	90.00%	77.00%
Europe [Member]
Geographic Location:
Total Revenue	1,793,841	1,986,195	3,489,656	3,569,963
Percentage of Revenue	7.00%	10.00%	6.00%	10.00%
Other location [Member]
Geographic Location:
Total Revenue	$ 1,534,081	$ 3,360,114	$ 2,314,735	$ 4,739,910
Percentage of Revenue	6.00%	16.00%	4.00%	13.00%