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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Cash flows from operating activities:    
Net loss $ (26,326,000) $ (18,874,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Foreign exchange (gain) / loss (1,000) 1,000
Depreciation of fixed assets 183,000 144,000
Amortization of intangibles 158,000 86,000
Amortization of right-of-use assets 296,000 285,000
Amortization of premium on investments 113,000 58,000
Change in contingent consideration liability 1,112,000 (60,000)
Gain on forgiveness of PPP loan (890,000)
Loss on liquidation of subsidiary 157,000
Compensation expense related to equity compensation 1,461,000 1,169,000
Deferred tax liabilities (377,000)
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable (262,000) (133,000)
Contract assets 234,000 (195,000)
Inventory (602,000) (292,000)
Other assets (527,000) 19,000
Accounts payable 47,000 217,000
Accrued expenses 1,469,000 (1,004,000)
Litigation payable (1,224,000)
Change in right of use lease liabilities (311,000) (309,000)
Contract liabilities 1,249,000 (74,000)
Net cash used in operating activities (21,707,000) (21,296,000)
Cash flows from investing activities:    
Redemptions of short term investments 64,923,000
Purchases of short term investments (43,442,000) (49,442,000)
Purchases of property, plant, and equipment (648,000) (145,000)
Leased WAM-Vs built and capitalized (371,000)
Payment for MAR acquisition, net of cash acquired (4,444,000)
Net cash (used in) provided by investing activities 20,462,000 (54,031,000)
Cash flows from financing activities:    
Proceeds from stock option exercises 90,000
Cash paid for tax withholding related to shares withheld (14,000) (3,000)
Net cash (used in)/provided by financing activities (14,000) 87,000
Effect of exchange rate changes on cash, cash equivalents and restricted cash (32,000)
Net decrease in cash, cash equivalents and restricted cash (1,259,000) (75,272,000)
Cash, cash equivalents and restricted cash, beginning of year 8,362,000 83,634,000
Cash, cash equivalents and restricted cash, end of year 7,103,000 8,362,000
Supplemental disclosure of noncash investing and financing activities:    
Issuance of stock for acquisition 5,855,000
Operating right of use asset obtained in exchange for operating lease liability 1,296,000
Contingent liability - MAR $ 1,591,000