Note 12 - Stockholders' Equity (Details Textual) - USD ($)				3 Months Ended	9 Months Ended
	Mar. 14, 2022	Mar. 11, 2022	Mar. 09, 2022	Mar. 31, 2022	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2021
Common Stock, Par or Stated Value Per Share (in dollars per share)				$ 0.001	$ 0.001		$ 0.001
Stock Issued During Period, Value, New Issues				$ 2,984,260
Payments of Stock Issuance Costs					$ 545,090	$ (0)
Preferred Stock, Shares Outstanding, Ending Balance (in shares)				49,360	49,360		49,360	[1]
Series B Convertible Preferred Stock [Member]
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)				20	20
Preferred Stock, Shares Outstanding, Ending Balance (in shares)				49,360	49,360		49,360
Preferred Stock, Convertible, Shares Issuable (in shares)				987,200	987,200
The Underwriter’s Warrants [Member]
Class of Warrant or Right, Percentage of Aggregate Shares Sold		5.00%
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	82,500
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 2.40			$ 2.40	$ 2.40
Class of Warrant or Right, Exercise Price, Percentage of Offering Price	120.00%
Warrants and Rights Outstanding	$ 132,000
The Underwriter’s Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0.0210
The Underwriter’s Warrants [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input	5
The Underwriter’s Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0
The Underwriter’s Warrants [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input	1.17
Underwritten Public Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)	1,897,500		1,650,000
Common Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.001
Shares Issued, Price Per Share (in dollars per share)			$ 2.00
Stock Issued During Period, Value, New Issues	$ 3,795,000
Underwritten Public Offering [Member] | Underwriting Discounts [Member]
Payments of Stock Issuance Costs	265,650
Underwritten Public Offering [Member] | Estimated Offering Expenses [Member]
Payments of Stock Issuance Costs	$ 545,090
Over-Allotment Option [Member]
Stock Issued During Period, Shares, New Issues (in shares)		247,500
Shares Issued, Price Per Share (in dollars per share)		$ 1.86
Shares Issued, Price Per Share, Discount Rate		7.00%	7.00%
Stock Issued During Period, Option to Purchase Additional Shares, Period of Recognition (Day)			45 days

[1] Derived from audited financial statements