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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2022
Jan. 31, 2021
Income Statement [Abstract]        
Revenues $ 484 $ 317 $ 1,003 $ 604
Cost of revenues 597 698 1,320 1,248
Gross loss (113) (381) (317) (644)
Operating expenses:        
Engineering and product development costs 2,465 1,019 7,518 3,334
Selling, general and administrative costs 2,974 1,763 7,933 5,591
Total operating expenses 5,439 2,782 15,451 8,925
Operating loss (5,552) (3,163) (15,768) (9,569)
Interest income, net 16 25 56 45
Other income (expense), net 60 (16) 60 (49)
Gain on extinguishment of PPP loan 890
Foreign exchange gain 5 3 13
Loss before income taxes (5,471) (3,151) (14,762) (9,560)
Income tax benefit 1,041
Net loss $ (5,471) $ (3,151) $ (13,721) $ (9,560)
Basic and diluted net loss per common share $ (0.10) $ (0.09) $ (0.26) $ (0.41)
Weighted average common shares used to compute basic and diluted net loss per common share 55,308,799 33,715,334 53,408,998 23,160,885