Note 4 - Valuation Assumptions (Details) - Fair Value, Inputs, Level 3 [Member] - $ / shares		9 Months Ended	12 Months Ended
		Sep. 30, 2015	Dec. 31, 2014
Series 2023 PIK Note Derivative Liability [Member]
Market price and estimated fair value of stock (in dollars per share)		$ 0.26	$ 0.73
Exercise price (in dollars per share)		$ 1.36	$ 1.36
Term (years) (1)	[1]	7 years 302 days	8 years 211 days
Expected volatility		65.50%	52.00%
Risk-free interest rate		1.84%	2.08%
Series A PIK Note Derivative Liability [Member]
Market price and estimated fair value of stock (in dollars per share)		$ 0.26	$ 0.73
Exercise price (in dollars per share)		$ 0.92	$ 0.92
Term (years) (1)	[1]	3 years 29 days	3 years 302 days
Expected volatility		65.50%	52.00%
Risk-free interest rate		1.84%	2.08%

[1] See NOTE 8 – CONVERTIBLE DEBT (PIK NOTES)