Consolidated Balance Sheets (Parenthetical) - USD ($)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Accounts receivable, allowance for doubtful accounts	$ 924,000	$ 1,698,000
Preferred stock, par value (in usd per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Common stock, par value (in usd per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	119,126,585	105,916,068
Treasury stock (in shares)	13,640,555	13,356,447
Preferred Shares
Redeemable convertible preferred stock, par value (in usd per share)	$ 0
Redeemable convertible preferred stock, cumulative percentage	5.00%
Redeemable convertible preferred stock, shares authorized (in shares)	215,000
Redeemable convertible preferred stock, shares issued (in shares)	75,000
Redeemable convertible preferred stock, redemption value	$ 759,583
Series A Preferred Stock
Preferred stock, dividend rate, percentage	6.00%
Preferred stock, shares issued (in shares)	2,300,000