Note 10 - Fair Value Measurement (Details) - Change in Level 3 Financial Liabilities Fair Value (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Derivatives:
Balance, beginning of year	$ (9,639,462)	$ (9,070,183)
Net realized gains/(losses)	0	0
Net Unrealized (gains)/losses relating to instruments still held at the reporting date	(1,517,719)	58,807
Net purchases, issuances and settlements	(868,127)	(628,086)
Net transfers in and/or out of Level 3	0	0
Balance, end of period	(12,025,308)	(9,639,462)
Conversion Feature Liability [Member]
Derivatives:
Balance, beginning of year	(2,944,402)	(3,126,206)
Net realized gains/(losses)	0	0
Net Unrealized (gains)/losses relating to instruments still held at the reporting date	(800,682)	181,804
Net purchases, issuances and settlements	0	0
Net transfers in and/or out of Level 3	0	0
Balance, end of period	(3,745,084)	(2,944,402)
Warrant Liability [Member]
Derivatives:
Balance, beginning of year	(6,695,060)	(5,943,977)
Net realized gains/(losses)	0	0
Net Unrealized (gains)/losses relating to instruments still held at the reporting date	(717,037)	(122,997)
Net purchases, issuances and settlements	(868,127)	(628,086)
Net transfers in and/or out of Level 3	0	0
Balance, end of period	$ (8,280,224)	$ (6,695,060)