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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share - (Details) - USD ($) | 12 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Net income available to common stockholders | $ 10,567,396 | $ 9,375,776
Weighted average shares outstanding basic | 6,350,862 | 6,539,376
Basic income per common share | $ 1.66 | $ 1.43
Common Stock [Member] |  |
Net income available to common stockholders | $ 9,908,920 | $ 8,801,974
Weighted average shares outstanding basic | 6,350,862 | 6,539,376
Basic income per common share | $ 1.56 | $ 1.35
Weighted average shares outstanding | 6,350,862 | 6,539,376
Class C Common Stock | 127,504 | 127,504
Total Denominator for diluted earnings per share | 6,478,366 | 6,666,880
Diluted income per common share | $ 1.53 | $ 1.32
Common Class C [Member] |  |
Net income available to common stockholders | $ 167,700 | $ 146,136
Weighted average shares outstanding basic | 382,513 | 382,513
Basic income per common share | $ 0.44 | $ 0.38
Weighted average shares outstanding | 382,513 | 382,513
Class C Common Stock | 0 | 0
Total Denominator for diluted earnings per share | 382,513 | 382,513
Diluted income per common share | $ 0.44 | $ 0.38

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