Note 7 - Preferred Stock (Details Textual) - USD ($)	1 Months Ended				12 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	May 31, 2017	Feb. 28, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Sep. 05, 2018
Preferred Stock, Par or Stated Value Per Share					$ 0.01	$ 0.01
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 0.03
Conversion from Series C Convertible Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Converted					420	298	132
Conversion of Stock, Shares Issued					28,000,000	19,862,000	1,400,000
Warrants Issued in Connection with Series C Preferred Stock [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				51,333,331
Adjustments to Additional Paid in Capital, Warrant Issued				$ 1,695,869
Series G Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights								47,169,812
Class of Warrant or Right, Exercise Price of Warrants or Rights								$ 0.02544
Warrants and Rights Outstanding, Term								3 years
Series A Convertible Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share					$ 1,000
Series B Convertible Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share					$ 1,000	$ 1,000
Preferred Stock, Shares Outstanding, Ending Balance					100	100
Convertible Preferred Stock, Total Conversion Shares					285,714
Preferred Stock, Value, Issued, Ending Balance					$ 76,095	$ 76,095
Series C Convertible Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share				$ 1,000	$ 1,000	$ 1,000
Preferred Stock, Shares Outstanding, Ending Balance					2,150	2,570
Convertible Preferred Stock, Total Conversion Shares					143,349,733
Preferred Stock, Value, Issued, Ending Balance					$ 705,238	$ 842,990
Stock Issued During Period, Shares, New Issues				3,000
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants, Total				$ 2,679,810
Stock Issued During Period, Value, New Issues				$ 983,941
Conversion of Stock, Shares Converted					420	298	132
Conversion of Stock, Shares Issued					28,000,000	19,862,000	1,400,000
Convertible Preferred Stock, Conversion Price Per Share						$ 0.05
Convertible Preferred Stock, Conversion Price1						0.015
Series D Convertible Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share			$ 1,000		$ 1,000	$ 1,000
Preferred Stock, Shares Outstanding, Ending Balance					0	1,000
Preferred Stock, Value, Issued, Ending Balance						$ 980,000
Stock Issued During Period, Shares, New Issues			1,000
Conversion of Stock, Shares Converted					1,000
Conversion of Stock, Shares Issued					66,666,666
Proceeds From Issuance Of Convertible Preferred Stock, Net of Issuance Cost			$ 980,000
Series E Convertible Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share		$ 1,000			$ 1,000	$ 1,000
Preferred Stock, Shares Outstanding, Ending Balance					1,200	0
Convertible Preferred Stock, Total Conversion Shares					47,169,812
Preferred Stock, Value, Issued, Ending Balance					$ 1,190,000
Stock Issued During Period, Shares, New Issues	600
Conversion of Stock, Shares Converted		600
Convertible Preferred Stock, Conversion Price1					$ 0.02544
Proceeds From Issuance Of Convertible Preferred Stock, Net of Issuance Cost	$ 600,000	$ 590,000