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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 |

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