Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY

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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
Total
Common Stock
Additional Paid-In Capital
Treasury Stock
Accumulated Deficit
Beginning balance at Apr. 30, 2021 $ 49,090,474 $ 25,067 $ 109,040,824 $ (1,817,414) $ (58,158,003)
Beginning balance (in shares) at Apr. 30, 2021   25,066,297      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation 542,712   542,712    
Common stock issued for stock options exercised for cash 22,548 $ 5 22,543    
Common stock issued for stock options exercised for cash (in shares)   5,097      
Common stock issued for vested restricted stock units 0 $ 16 (16)    
Common stock issued for vested restricted stock units (in shares)   15,657      
Amortization of warrant-based cost issued for services 11,458   11,458    
Net loss (870,888)       (870,888)
Ending balance at Jul. 31, 2021 48,796,304 $ 25,088 109,617,521 (1,817,414) (59,028,891)
Ending balance (in shares) at Jul. 31, 2021   25,087,051      
Beginning balance at Apr. 30, 2022 $ 42,545,724 $ 25,358 112,081,564 (1,817,414) (67,743,784)
Beginning balance (in shares) at Apr. 30, 2022 25,202,278 25,357,764      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation $ 46,330   46,330    
Amortization of warrant-based cost issued for services 7,000   7,000    
Net loss (3,714,971)       (3,714,971)
Ending balance at Jul. 31, 2022 $ 38,884,083 $ 25,358 $ 112,134,894 $ (1,817,414) $ (71,458,755)
Ending balance (in shares) at Jul. 31, 2022 25,202,278 25,357,764