Consolidated Balance Sheets (Parenthetical) - USD ($)	Sep. 30, 2021	Jun. 30, 2021
Consolidated Balance Sheets
Allowance for doubtful trade accounts receivable	$ 33,418	$ 45,643
Preferred stock: Series D, par value	$ 0.01	$ 0.01
Preferred stock: Series D, shares authorized	500,000	500,000
Preferred stock: Series D, shares issued	0	0
Preferred stock: Series D, shares outstanding	0	0
Common stock: Class A, par value	$ 0.01	$ 0.01
Common stock: Class A, shares authorized	44,500,000	44,500,000
Common stock: Class A, shares issued	26,994,534	26,985,913
Common stock: Class A, shares outstanding	26,994,534	26,985,913

Amount of allowance for credit loss on accounts receivable, classified as current.

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