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Discontinued Operations - results of operations (Details) - USD ($)
 3 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Discontinued Operations and Disposal Groups [Abstract]    
Revenues $ 1,869,219 $ 1,942,720
Cost of goods sold 1,385,116 1,667,213
Gross margin 484,103 275,507
Operating expenses    
Operations 209,980 161,783
Research and development 46,249 82,806
Sales and marketing 404,104 195,278
General and administrative 43,606 55,161
Total operating expenses 703,939 495,028
Operating loss (219,836) (219,521)
Other (income) expense    
Interest expense 22,856
Other, net (119) (124)
Other (income) expense 22,737 (124)
Net loss from discontinued operations $ (242,573) $ (219,397)