Consolidated Balance Sheets (Parentheticals) - USD ($)	Jun. 30, 2022	Jun. 30, 2021
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 2,027	$ 41,500
Common stock, par value (in dollars per share)	$ 0.005	$ 0.005
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	9,147,795	8,608,706
Common stock, shares outstanding (in shares)	9,147,795	8,608,706