Note 9 - Warrants (Details Textual) | Jun. 28, 2019$ / sharesshares | Apr. 17, 2019USD ($)$ / sharesshares | Mar. 20, 2019USD ($)shares | Mar. 31, 2018$ / sharesshares | Feb. 28, 2018$ / sharesshares | Feb. 08, 2018shares | Jul. 10, 2017$ / sharesshares | Aug. 31, 2019USD ($)$ / sharesshares | Feb. 28, 2019$ / sharesshares | Mar. 15, 2018$ / sharesshares | Mar. 14, 2018$ / shares |
Class of Warrant or Right, Issued During Period (in shares) | | | | | | | | | 2,925,000 | | | |
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share) | $ / shares | [1] | | | | | | | | $ 0.25 | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | [1] | | | | | $ 0.61 | | | $ 0.37 | $ 1 | | |
Class of Warrant or Right, Outstanding (in shares) | | | | | | 2,129,802 | | | 5,054,802 | 2,129,802 | | |
Warrants Issued in the 2018 Offering [Member] | | | | | | | | | | | | |
Class of Warrant or Right, Issued During Period (in shares) | | | | | | | | 500,000 | | | | |
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share) | $ / shares | | | | | | | | $ 0.21 | | | | |
Warrants and Rights Outstanding, Term (Month) | | | | | | 2 years | | 1 year | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | | | | | | $ 0.15 | | | | | | |
Amended Warrants With An Expiration Date of June 9, 2020 [Member] | | | | | | | | | | | | |
Class of Warrant or Right, Issued During Period (in shares) | | | | | 500,000 | | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | | | | | $ 1 | | | | | | | |
Warrants Issued to Two Investors [Member] | | | | | | | | | | | | |
Class of Warrant or Right, Issued During Period (in shares) | | | | | | 833,333 | | | | | | |
Class of Warrant or Right, Issued During Period, Exercise Price (in dollars per share) | $ / shares | | | | | | $ 1 | | | | | | |
Warrants and Rights Outstanding, Term (Month) | | | | | | 2 years | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | | | | | | 833,333 | | | | | | |
Warrants Issued to Two Service Providers [Member] | | | | | | | | | | | | |
Class of Warrant or Right, Issued During Period (in shares) | | | | | | | 296,469 | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | | | | | | | 296,469 | | | | | |
Amended Warrants [Member] | | | | | | | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | | | | | | | | | | | $ 1 | $ 0.13 |
Class of Warrant or Right, Outstanding (in shares) | | | | | | | | | | | 500,000 | |
Warrants Granted March 20, 2019 [Member] | | | | | | | | | | | | |
Class of Warrant or Right, Issued During Period (in shares) | | | | 1,250,000 | | | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | | | | | | | | | $ 0.25 | | | |
Class of Warrant or Right, Outstanding (in shares) | | | | | | | | | 1,250,000 | | | |
Warrants and Rights Outstanding | $ | | | | $ 200,439 | | | | | | | | |
Warrants Granted April 17, 2019 [Member] | | | | | | | | | | | | |
Class of Warrant or Right, Issued During Period (in shares) | | | 675,000 | | | | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | | | | | | | | | $ 0.25 | | | |
Class of Warrant or Right, Outstanding (in shares) | | | | | | | | | 675,000 | | | |
Warrants and Rights Outstanding | $ | | | $ 74,250 | | | | | | | | | |
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) | $ / shares | | | $ 0.25 | | | | | | | | | |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | | | 1,925,000 | | | | | | | | | |
Warrants and Rights Outstanding | $ | | | $ 274,689 | | | | | | | | | |
Warrants Issued to Eight Investors [Member] | Measurement Input, Exercise Price [Member] | | | | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input | | | 0.25 | | | | | | | | | |
Warrants Issued to Eight Investors [Member] | Measurement Input, Price Volatility [Member] | | | | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input | | | 2.28 | | | | | | | | | |
Warrants Issued to Eight Investors [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member] | | | | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input | | | 0.0234 | | | | | | | | | |
Warrants Issued to Eight Investors [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member] | | | | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input | | | 0.0237 | | | | | | | | | |
Warrants Granted June 28, 2019 [Member] | | | | | | | | | | | | |
Class of Warrant or Right, Issued During Period (in shares) | | 1,000,000 | | | | | | | | | | |
Warrants and Rights Outstanding, Term (Month) | | 1 year 180 days | | | | | | | | | | |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares | | $ 0.25 | | | | | | | $ 0.25 | | | |
Class of Warrant or Right, Outstanding (in shares) | | | | | | | | | 1,000,000 | | | |
Warrants and Rights Outstanding | $ | | | | | | | | | $ 176,579 | | | |
Warrants Granted June 28, 2019 [Member] | Measurement Input, Exercise Price [Member] | | | | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input | | 0.25 | | | | | | | | | | |
Warrants Granted June 28, 2019 [Member] | Measurement Input, Price Volatility 1 [Member] | | | | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input | | 360.99 | | | | | | | | | | |
Warrants Granted June 28, 2019 [Member] | Measurement Input, Price Volatility 2 [Member] | | | | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input | | 351.88 | | | | | | | | | | |
Warrants Granted June 28, 2019 [Member] | Measurement Input, Price Volatility 3 [Member] | | | | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input | | 339.45 | | | | | | | | | | |
Warrants Granted June 28, 2019 [Member] | Measurement Input, Discount Rate 1 [Member] | | | | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input | | 1.75 | | | | | | | | | | |
Warrants Granted June 28, 2019 [Member] | Measurement Input, Discount Rate 2 [Member] | | | | | | | | | | | | |
Warrants and Rights Outstanding, Measurement Input | | 1.71 | | | | | | | | | | |
Warrants Extended Terms for Two and Half Years [Member] | | | | | | | | | | | | |
Class of Warrant or Right, Issued During Period (in shares) | | 500,000 | | | | | | | | | | |
Warrants and Rights Outstanding, Term (Month) | | 2 years 182 days | | | | | | | | | | |
Warrants Extended Terms for Two Years [Member] | | | | | | | | | | | | |
Class of Warrant or Right, Issued During Period (in shares) | | 500,000 | | | | | | | | | | |
Warrants and Rights Outstanding, Term (Month) | | 2 years | | | | | | | | | | |
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[1] | Weighted average exercise price per shares | |