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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