Note 14 - Segment and Geographic Information (Details) - Product revenue by geographic location in total and as a percentage of total product revenue, for th (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Note 14 - Segment and Geographic Information (Details) - Product revenue by geographic location in total and as a percentage of total product revenue, for th [Line Items]
Total revenue (in Dollars)	$ 17,754,438	$ 14,766,611	$ 53,829,826	$ 48,752,040
Percentage of total revenue	100.00%	100.00%	100.00%	100.00%
United States [Member]
Note 14 - Segment and Geographic Information (Details) - Product revenue by geographic location in total and as a percentage of total product revenue, for th [Line Items]
Total revenue (in Dollars)	14,485,821	12,628,612	42,251,336	40,463,657
Percentage of total revenue	82.00%	86.00%	78.00%	83.00%
Europe [Member]
Note 14 - Segment and Geographic Information (Details) - Product revenue by geographic location in total and as a percentage of total product revenue, for th [Line Items]
Total revenue (in Dollars)	1,656,656	1,064,165	5,226,619	3,993,708
Percentage of total revenue	9.00%	7.00%	10.00%	8.00%
Other location [Member]
Note 14 - Segment and Geographic Information (Details) - Product revenue by geographic location in total and as a percentage of total product revenue, for th [Line Items]
Total revenue (in Dollars)	$ 1,611,961	$ 1,073,834	$ 6,351,871	$ 4,294,675
Percentage of total revenue	9.00%	7.00%	12.00%	9.00%