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Consolidated Balance Sheets (Parenthetical) - USD ($)
May 31, 2023
May 31, 2022
Accumulated amortization $ 617,000 $ 725,000
Preferred stock, par value $ 0 $ 0
Preferred stock, shares authorized 4,428,571 4,428,571
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.08 $ 0.08
Common stock, shares authorized 25,000,000 25,000,000
Common stock, shares issued 16,821,646 12,867,924
Common stock, shares outstanding 16,821,646 12,867,924
Series A Preferred Stock [Member]    
Preferred stock, par value $ 0.08 $ 0.08
Preferred stock, shares authorized 571,429 571,429
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0