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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per share - (Details) - USD ($) | 12 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024
Net income available to common stockholders | $ 8,334,261 | $ 10,567,396
Weighted average shares outstanding basic | 6,906,803 | 7,046,959
Basic income per common share | $ 1.21 | $ 1.50
Common Stock [Member] |  |
Net income available to common stockholders | $ 7,802,352 | $ 9,908,920
Weighted average shares outstanding basic | 6,210,852 | 6,351,008
Basic income per common share | $ 1.26 | $ 1.56
Weighted average shares outstanding | 6,210,852 | 6,351,008
Class C Common Stock | 127,504 | 127,504
Total Denominator for diluted earnings per share | 6,338,356 | 6,478,512
Diluted income per common share | $ 1.23 | $ 1.53
Class C Common Stock [Member] |  |
Net income available to common stockholders | $ 135,467 | $ 167,700
Weighted average shares outstanding basic | 382,513 | 382,513
Basic income per common share | $ 0.35 | $ 0.44
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 | $ 0.35 | $ 0.44
Class A Preferred Stock [Member] |  |
Net income available to common stockholders | $ 396,443 | $ 490,776
Weighted average shares outstanding basic | 313,438 | 313,438
Basic income per common share | $ 1.26 | $ 1.57

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