Note 9 - Stockholders' Equity (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Feb. 28, 2018	Dec. 31, 2017
Conversion of Stock, Shares Converted				795	58
Conversion of Stock, Shares Issued				53,000,000	3,862,000
Preferred Stock, Par or Stated Value Per Share		$ 0.01		$ 0.01			$ 0.01
Stock Issued During Period, Shares, Issued for Services				5,000,000
Warrants and Rights Outstanding, Term						5 years
Class of Warrant or Right, Number of Securities Called by Warrants or Rights						178,571
Common Stock, Par or Stated Value Per Share		$ 0.001		$ 0.001		$ 0.042	$ 0.001
Class of Warrant or Right, Outstanding		0		0
Employee Stock Option [Member]
Allocated Share-based Compensation Expense, Total		$ 23,221	$ 14,522	$ 47,199	$ 29,102
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total		168,503		$ 168,503
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				2 years 36 days
Common Stock Issued For Services [Member]
Allocated Share-based Compensation Expense, Total		57,143		$ 85,714
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total		$ 114,286		$ 114,286
Series B Convertible Preferred Stock [Member]
Preferred Stock, Shares Outstanding, Ending Balance		100		100			100
Convertible Preferred Stock, Conversion Price1		$ 0.35		$ 0.35
Convertible Preferred Stock, Total Conversion Shares		285,714		285,714
Conversion of Stock, Shares Converted				0
Preferred Stock, Par or Stated Value Per Share		$ 1,000		$ 1,000			$ 1,000
Series C Convertible Preferred Stock [Member]
Preferred Stock, Shares Outstanding, Ending Balance		2,570		2,570			2,570
Convertible Preferred Stock, Conversion Price1		$ 0.015		$ 0.015
Convertible Preferred Stock, Total Conversion Shares		171,349,733		171,349,733
Conversion of Stock, Shares Converted				0
Preferred Stock, Par or Stated Value Per Share		$ 1,000		$ 1,000			$ 1,000
Series D Convertible Preferred Stock [Member]
Preferred Stock, Shares Outstanding, Ending Balance		205		205			1,000
Convertible Preferred Stock, Conversion Price1		$ 0.015		$ 0.015
Convertible Preferred Stock, Total Conversion Shares		13,666,666		13,666,666
Conversion of Stock, Shares Converted				795
Conversion of Stock, Shares Issued				53,000,000
Preferred Stock, Par or Stated Value Per Share		$ 1,000		$ 1,000			$ 1,000
Series E Convertible Preferred Stock [Member]
Preferred Stock, Shares Outstanding, Ending Balance		600		600			0
Convertible Preferred Stock, Conversion Price1		$ 0.08		$ 0.08
Conversion of Stock, Shares Converted	600
Preferred Stock, Par or Stated Value Per Share	$ 1,000	$ 1,000		$ 1,000			$ 1,000
Proceeds From Issuance Of Convertible Preferred Stock, Net of Issuance Cost	$ 590,000