Note 10 - Fair Value Measurement (Detail) - Level 3 Financial Assets And Financial Liabilities At Fair Value (USD $)	3 Months Ended	12 Months Ended					3 Months Ended	12 Months Ended					3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2012 Conversion Feature Liability [Member] Beginning of Period [Member]	Dec. 31, 2011 Conversion Feature Liability [Member] Beginning of Period [Member]	Mar. 31, 2013 Conversion Feature Liability [Member] End of Period [Member]	Dec. 31, 2012 Conversion Feature Liability [Member] End of Period [Member]	Mar. 31, 2013 Conversion Feature Liability [Member]	Dec. 31, 2012 Conversion Feature Liability [Member]	Dec. 31, 2012 Warrant Liability [Member] Beginning of Period [Member]	Dec. 31, 2011 Warrant Liability [Member] Beginning of Period [Member]	Mar. 31, 2013 Warrant Liability [Member] End of Period [Member]	Dec. 31, 2012 Warrant Liability [Member] End of Period [Member]	Mar. 31, 2013 Warrant Liability [Member]	Dec. 31, 2012 Warrant Liability [Member]	Dec. 31, 2012 Beginning of Period [Member]	Dec. 31, 2011 Beginning of Period [Member]	Mar. 31, 2013 End of Period [Member]	Dec. 31, 2012 End of Period [Member]
Derivatives:
Balance, Beginning of year			$ 2,287,323	$ 758,911	$ 4,517,537	$ 2,287,323			$ 6,287,598	$ 1,692,708	$ 8,362,725	$ 6,287,598			$ 8,574,921	$ 2,451,619	$ 12,880,262	$ 8,574,921
Net realized gains/(losses)	0	0					0	0					0	0
Net unrealized (gains)/losses relating to instruments still held at the reporting date	3,905,199	6,123,302					2,230,214	1,528,412					1,674,985	4,594,890
Net purchases, issuances and settlements	400,142	0					0	0					400,142	0
Net transfers In and/or out of level 3	0	0					0	0					0	0
Balance, end of period			$ 2,287,323	$ 758,911	$ 4,517,537	$ 2,287,323			$ 6,287,598	$ 1,692,708	$ 8,362,725	$ 6,287,598			$ 8,574,921	$ 2,451,619	$ 12,880,262	$ 8,574,921