Note 3 - Equity - Schedule of Warrants (Details)	9 Months Ended
	Mar. 31, 2022 $ / shares shares
Class of Warrant or Right, Outstanding (in shares) | shares	1,108,805
Class of Warrant or Right, Weighted Average Remaining Contractual Term (Year)	10 months 6 days
Class of Warrant or Right, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 4.13
Class of Warrant or Right, Warrants, Exercisable, Number (in shares) | shares	1,108,805
Class of Warrant or Right, Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 4.13
Exercise Price, Four Dollars, Minimum [Member]
Class of Warrant or Right, Outstanding (in shares) | shares	1,085,068
Class of Warrant or Right, Weighted Average Remaining Contractual Term (Year)	10 months 6 days
Class of Warrant or Right, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 4.00
Class of Warrant or Right, Warrants, Exercisable, Number (in shares) | shares	1,085,068
Class of Warrant or Right, Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 4.00
Exercise Price, Ten Dollars, Maximum [Member]
Class of Warrant or Right, Outstanding (in shares) | shares	23,737
Class of Warrant or Right, Weighted Average Remaining Contractual Term (Year)	9 months 25 days
Class of Warrant or Right, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 10.00
Class of Warrant or Right, Warrants, Exercisable, Number (in shares) | shares	23,737
Class of Warrant or Right, Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 10.00