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Note 5 - Stockholders' Equity (Details Textual) - USD ($)				1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 01, 2022	May 27, 2022	Jan. 19, 2022	Aug. 31, 2022	Mar. 31, 2021	Jun. 30, 2022	May 29, 2028	May 27, 2027
Stock Issued During Period, Value, New Issues					$ 9,408,920
Class of Warrant or Right, Outstanding (in shares)						23,405,329
Stock Incentive Plan 2020 [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)						1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)						0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)						962,300
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)						$ 3.18
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)						68,500
Pre-Funded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		11,071,214	2,360,000
Class of Warrant or Right, Exercised (in shares)	3,690,910	1,980,304
Class of Warrant or Right, Outstanding (in shares)						5,400,000
Common Warrant [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			3,067,484
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 3.26
Preferred Investment Options [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		12,121,214
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 1.65
Preferred Investment Options [Member] | Forecast [Member]
Class of Warrant or Right, Exercised (in shares)				3,030,304
Class of Warrant or Right, Outstanding (in shares)				9,090,910
Class Of Warrant Or Rights, Amount Of Shares To Expire (in shares)							9,090,910	3,030,304
Stock Purchase Warrants [Member]
Warrants and Rights Outstanding, Term (Year)						8 years 9 months 18 days
Private Placement [Member]
Stock Issued During Period, Value, New Issues		$ 1,050,000	$ 707,484
Proceeds from Issuance or Sale of Equity, Total		$ 18,500,000	$ 9,200,000

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