Note 10 - Share-Based Payments (Detail) - Warrants Outstanding (USD $)	Sep. 24, 2012	May 31, 2011	Mar. 31, 2013 Expired (Member)	Dec. 31, 2012 Beginning Balance (Member)	Mar. 31, 2013 Ending Balance (Member)
Warrants outstanding at December 31, 2012				25,115,796	24,104,052
Warrants outstanding at December 31, 2012 (in Dollars per Item)	0.10	0.63		1.64	1.61
Expired			(1,011,744)
Expired (in Dollars per share)			$ 2.58
Warrants outstanding at March 31, 2013				25,115,796	24,104,052
Warrants outstanding at March 31, 2013 (in Dollars per Item)	0.10	0.63		1.64	1.61