CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)	Dec. 31, 2021	Jun. 30, 2021
Allowance for doubtful accounts on trade receivables (in dollars)	$ 474	$ 14,948
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)	$ 2,415,000	$ 2,385,000
Prior Cumulative Preferred Stock - Series B
Preferred stock, liquidation preference (in dollars)	$ 2,370,000	$ 2,340,000
Convertible Cumulative Preferred
Preferred stock, par value (in dollars per share)	$ 20	$ 20
Cumulative Preferred Stock - Series A
Preferred stock, liquidation preference (in dollars)	$ 5,399,662	$ 5,341,129
Cumulative Preferred Stock - Series B
Preferred stock, liquidation preference (in dollars)	$ 879,980	$ 870,441