Note 9 - Warrants (Details Textual) | Apr. 17, 2019USD ($)$ / sharesshares | Mar. 20, 2019USD ($)shares | Mar. 31, 2018$ / sharesshares | Jul. 10, 2017$ / sharesshares | May 31, 2021$ / sharesshares | Feb. 28, 2021$ / sharesshares | Feb. 29, 2020$ / shares | Feb. 28, 2018$ / shares |
Class of Warrant or Right, Issued During Period (in shares) | shares | | | | | | | | | |
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share) | [1] | | | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | [1] | | | | | 0.25 | $ 0.25 | $ 0.25 | |
Warrants Issued in the 2018 Offering [Member] | | | | | | | | | |
Class of Warrant or Right, Issued During Period (in shares) | shares | | | | | 500,000 | | | | |
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share) | | | | | $ 0.21 | | | | |
Warrants and Rights Outstanding, Term (Month) | | | | | 1 year | | | | 2 years |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | | | | | | | | | $ 0.15 |
Amended Warrants With An Expiration Date of June 9, 2020 [Member] | | | | | | | | | |
Class of Warrant or Right, Issued During Period (in shares) | shares | | | | 500,000 | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | | | | $ 1 | | | | | |
Warrants Granted March 20, 2019 [Member] | | | | | | | | | |
Class of Warrant or Right, Issued During Period (in shares) | shares | | | 1,250,000 | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | | | | | | $ 0.25 | | | |
Warrants and Rights Outstanding | $ | | $ 76,243 | $ 200,439 | | | | | | |
Warrants Granted April 17, 2019 [Member] | | | | | | | | | |
Class of Warrant or Right, Issued During Period (in shares) | shares | | 675,000 | | | | | | | |
Warrants Issued to Eight Investors [Member] | | | | | | | | | |
Warrants and Rights Outstanding, Term (Month) | | 3 years | | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | | $ 0.25 | | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares | | 1,925,000 | | | | | | | |
Warrants and Rights Outstanding | $ | | $ 276,682 | | | | | | | |
Warrants Issued to Eight Investors [Member] | Measurement Input, Exercise Price [Member] | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input (in dollars per share) | | 0.25 | | | | | | | |
Warrants Issued to Eight Investors [Member] | Measurement Input, Price Volatility [Member] | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input (in dollars per share) | | 2.28 | | | | | | | |
Warrants Issued to Eight Investors [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member] | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input (in dollars per share) | | 0.0234 | | | | | | | |
Warrants Issued to Eight Investors [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member] | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input (in dollars per share) | | 0.0237 | | | | | | | |
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[1] | Weighted average exercise price per shares | |