Note 13 - Segment and Geographic Information (Details) - Product Revenue by Geographic Location (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Geographic Location:
Total Revenue	$ 22,055,423	$ 17,754,438	$ 82,340,370	$ 53,829,826
Percentage of Revenue	100.00%	100.00%	100.00%	100.00%
United States [Member]
Geographic Location:
Total Revenue	18,455,167	14,485,821	72,935,722	42,251,336
Percentage of Revenue	84.00%	82.00%	89.00%	78.00%
Europe [Member]
Geographic Location:
Total Revenue	1,784,414	1,656,656	5,274,071	5,226,619
Percentage of Revenue	8.00%	9.00%	6.00%	10.00%
Other location [Member]
Geographic Location:
Total Revenue	$ 1,815,842	$ 1,611,961	$ 4,130,577	$ 6,351,871
Percentage of Revenue	8.00%	9.00%	5.00%	12.00%