CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parentheticals) - USD ($)	Mar. 31, 2023	Jun. 30, 2022
Allowance for doubtful accounts on trade receivables (in dollars)	$ 1,659	$ 948
Common stock, par value (in dollars per share)	$ 1	$ 1
Prior Cumulative Preferred Stock
Preferred stock, par value (in dollars per share)	$ 5	$ 5
Prior Cumulative Preferred Stock - Series A
Preferred stock, liquidation preference (in dollars)	$ 2,452,500	$ 2,430,000
Prior Cumulative Preferred Stock - Series B
Preferred stock, liquidation preference (in dollars)	$ 2,407,500	$ 2,385,000
Convertible Cumulative Preferred
Preferred stock, par value (in dollars per share)	$ 20	$ 20
Cumulative Preferred Stock - Series A
Preferred stock, liquidation preference (in dollars)	$ 5,472,828	$ 5,428,928
Cumulative Preferred Stock - Series B
Preferred stock, liquidation preference (in dollars)	$ 891,904	$ 884,750