Note 8 - Equity Transactions (Details Textual)			1 Months Ended			3 Months Ended	4 Months Ended	12 Months Ended
	May 31, 2019 USD ($) $ / shares shares	May 23, 2018 shares	Jan. 30, 2019 USD ($)	Apr. 30, 2018 USD ($) $ / shares shares	Apr. 30, 2014	Mar. 30, 2018 USD ($)	Apr. 30, 2018 $ / shares shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 shares	May 22, 2018 shares	Oct. 31, 2017 shares
Share-based Payment Arrangement, Expense | $								$ 168,120	$ 83,420
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture									0
Proceeds from Issuance of Private Placement | $						$ 74,983
Common Stock, Shares Authorized		500,000,000						500,000,000	500,000,000		100,000,000
Conversion of Preferred Stock to Common Stock, Number of Shares Issued Per Share Converted		400
Increase (Decrease) in Number of Common Shares Outstanding		14,240,000
Equity Units, Number of Common Shares in Each Unit									1
Proceeds from Issuance or Sale of Equity, Net of Issuance Costs | $								$ 7,120,000
Series B Preferred Stock [Member]
Convertible Preferred Stock, Shares Issued upon Conversion												400
Scarsdale Agreement Warrants [Member]
Term of Warrant							7 years
Class of Warrant or Right, Percentage of Securities Issued Called by Warrants or Rights					6.00%
Class of Warrant or Right, Exercise Price, Percentage of Offering Price					100.00%
Warrants Issued with Units [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights				400			400
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 0.30			$ 0.25			$ 0.25
Warrants To Purchase Common Stock [Member]
Term of Warrant									7 years
Warrants Issued to Placement Agent in Connection with Private Placement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights	1,359,000
Warrants to Purchase Units Sold in May 2016 Private Placement [Member]
Term of Warrant									7 years
Class of Warrant or Right, Number of Securities Called by Warrants or Rights									480,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares									$ 0.25
Warrants to Purchase Units Sold in February 2017 Private Placement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights									164,074
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares									$ 0.35
Warrants to Purchase Units Sold in October 2017 Private Placement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights									600
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares									$ 100
Financial Advisory and Exclusive Placement Agent Agreement [Member] | Scarsdale [Member]
Private Placement Fee, Percentage of Proceeds					6.00%
Private Placement [Member]
Equity Units, Number of Series B Convertible Preferred Stock in Each Unit				1			1
Term of Warrant							7 years
Equity Units Issued During Period, Shares, New Issues	29,770,000			20,100					3,519,963
Share Price | $ / shares				$ 100			$ 100		$ 0.65
Proceeds from Issuance of Private Placement | $	$ 7,442,500		$ 130,063	$ 2,010,000					$ 2,342,034
Payment for Cash Fee | $									$ 50,000
Equity Units, Number of Common Shares in Each Unit	1
Shares Issued, Price Per Share | $ / shares	$ 0.25
Equity Units, Number of Warrants in Each Unit	1
Payments of Stock Issuance Costs | $	$ 452,900
Proceeds from Issuance or Sale of Equity, Net of Issuance Costs | $	$ 6,989,600
Private Placement [Member] | Series B Preferred Stock [Member]
Convertible Preferred Stock, Shares Issued upon Conversion				400			400
Employees [Member]
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture								450,000
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture | $								$ 87,750
Director [Member]
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture								241,666
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture | $								$ 109,908
Board Members and Officers [Member]
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture								344,000
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture | $								$ 158,670
Share Based Payment Arrangement By Share Based Compensation Arrangement, Deferred Compensation, Shares Acrrued									172,000	172,000