Note 11 - Subsequent Events (Details Textual) - USD ($)	1 Months Ended	9 Months Ended
	May 10, 2021	Mar. 31, 2021	Mar. 31, 2020
Sale of Units, Value		$ 1,850,000	$ 1,159,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.75
Class of Warrant or Right, Exercised During Period (in shares)		5,000
Common Stock Shares Issued upon Exercise of Warrants (in shares)		5,000
Proceeds from Warrant Exercises		$ 3,750
President [Member]
Number of Shares Per Unit (in shares)		1
Number of Warrants Per Unit (in shares)		1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.75
Deferred Compensation, Converted to Units, Amount		$ 127,660
Subsequent Event [Member] | Consultant [Member]
Deferred Compensation, Converted to Units, Amount	$ 244,143
Deferred Compensation Converted to Common Stock Shares (in shares)	488,287
Subsequent Event [Member] | Warrants Exercised for Restricted Stock [Member]
Class of Warrant or Right, Exercised During Period (in shares)	705,981
Common Stock Shares Issued upon Exercise of Warrants (in shares)	705,981
Proceeds from Warrant Exercises	$ 529,486
Subsequent Event [Member] | Sale of Units [Member]
Sale of Units, Number of Units Issued (in shares)	20,000
Shares Issued, Price Per Share (in dollars per share)	$ 0.50
Sale of Units, Value	$ 10,000
Number of Shares Per Unit (in shares)	1
Number of Warrants Per Unit (in shares)	1
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.75
Subsequent Event [Member] | Sale of Units in Exchange for Salary and Expenses [Member] | President [Member]
Sale of Units, Number of Units Issued (in shares)	85,833
Sale of Units in Exchange for Salary and Expense, Salary Amount	$ 36,000
Sale of Units in Exchange for Salary and Expenses, Expense Amount	$ 10,060