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Consolidated Balance Sheets (Parentheticals) - USD ($)
Jun. 30, 2024
Jun. 30, 2023
Allowance for Doubtful Accounts $ 227,573 $ 170,103
Preferred Stock, authorized (in shares) 30,000,000 30,000,000
Preferred Stock, par value (in dollars per share) $ 0.01 $ 0.01
Common Stock, par value (in dollars per share) $ 0.01 $ 0.01
Common Stock, authorized (in shares) 50,000,000 50,000,000
Common Stock, issued (in shares) 18,234,893 18,309,051
Common stock, outstanding (in shares) 18,234,893 18,309,051
Series B Preferred Stock [Member]    
Preferred Stock, authorized (in shares) 700,000 700,000
Preferred Stock, issued (in shares) 616,470 625,375
Preferred Stock, outstanding (in shares) 616,470 625,375
Series B-1 Preferred Stock [Member]    
Preferred Stock, authorized (in shares) 550,000 550,000
Preferred Stock, issued (in shares) 0 212,402
Preferred Stock, outstanding (in shares) 0 212,402