Note 8 - Stockholders' Equity (Details Textual) - USD ($)			2 Months Ended	3 Months Ended		9 Months Ended
	Aug. 19, 2016	Feb. 15, 2016	Feb. 29, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 14, 2016	Jun. 13, 2016	Dec. 31, 2015
Series C Convertible Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues			1,400,000
Conversion of Stock, Shares Converted			132			132
Preferred Stock, Shares Outstanding				2,868		2,868				3,000
Convertible Preferred Stock, Total Conversion Shares				30,460,662		30,460,662
Common Stock, Capital Shares Reserved for Future Issuance				30,460,662		30,460,662
Series B Convertible Preferred Stock [Member]
Preferred Stock, Shares Outstanding				100		100				100
Convertible Preferred Stock, Total Conversion Shares				285,714		285,714
Common Stock, Capital Shares Reserved for Future Issuance				285,714		285,714
Common Stock Warrants [Member]
Stock Issued During Period, Shares, New Issues						15,821,920
Series E Warrants [Member]
Warrant Exercise Fee Per Share		$ 0.02916
Class of Warrant or Right, Exercised During Period	3,600,000	3,664,588
Proceeds from Warrant Exercises		$ 238,198
General and Administrative Expense		$ 469,799
Series A Warrants [Member]
Warrant Exercise Fee Per Share	$ 0.02916
Class of Warrant or Right, Exercised During Period	1,207,332
Series A Warrants and Series E Warrants [Member]
Proceeds from Warrant Exercises	$ 312,477
General and Administrative Expense	$ 15,030
2006 Equity Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance				1,722,529		1,722,529
Equity Incentive Plan 2016 [Member]
Common Stock, Capital Shares Reserved for Future Issuance				3,000,000		3,000,000
Common Stock, Shares Authorized				300,000,000		300,000,000		300,000,000	150,000,000	150,000,000
Common Stock, Capital Shares Reserved for Future Issuance				76,089,142		76,089,142
Class of Warrant or Right, Exercised During Period						(15,821,920)
Proceeds from Warrant Exercises						$ 477,750
General and Administrative Expense				$ 220,707	$ 335,932	$ 1,472,030	$ 1,102,262
Stock Issued During Period, Shares, Warrants Exercised						7,350,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				$ 54,286		$ 54,286
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition						1 year 255 days