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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Cash flows from operating activities:    
Net loss $ (10,696,000) $ (8,250,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Foreign exchange loss (gain) 5,000
Depreciation of fixed assets 117,000 70,000
Amortization of intangible assets 79,000 12,000
Amortization of right of use asset 152,000 139,000
Amortization of premium on marketable securities 191,000
Change in contingent consideration liability (221,000)
Gain on extinguishment of PPP Loan (891,000)
Compensation expense related to equity compensation 632,000 547,000
Changes in operating assets and liabilities:    
Accounts receivable (105,000) 170,000
Contract assets 85,000 (135,000)
Inventory (586,000)
Other assets (2,180,000) (73,000)
Accounts payable (316,000) (410,000)
Accrued expenses 680,000 (305,000)
Change in lease liability (166,000) (147,000)
Contract liabilities 1,333,000 117,000
Litigation payable (1,224,000)
Net cash used in operating activities (11,001,000) (10,375,000)
Cash flows from investing activities:    
Redemptions of marketable securities 33,150,000
Purchases of marketable securities (20,108,000)
Dividends and interest on investments 283,000
Purchase of property, plant and equipment (179,000) (24,000)
Net cash provided by (used in) investing activities 13,146,000 (24,000)
Cash flows from financing activities:    
Proceeds from stock option exercises 21,000
Net cash provided by financing activities 21,000
Effect of exchange rate changes on cash, cash equivalents and restricted cash (20,000)
Net increase / (decrease) in cash, cash equivalents and restricted cash 2,145,000 (10,398,000)
Cash, cash equivalents and restricted cash, beginning of period 8,362,000 83,634,000
Cash, cash equivalents and restricted cash, end of period $ 10,507,000 $ 73,236,000