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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Cash flows from operating activities:    
Net loss $ (7,039,000) $ (5,852,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of fixed assets 71,000 43,000
Amortization of intangible assets 40,000 40,000
Amortization of right of use asset 135,000 75,000
(Accretion of discount)/amortization of premium on investments (106,000) 220,000
Change in contingent consideration liability (62,000) (131,000)
Stock based compensation 401,000 333,000
Changes in operating assets and liabilities:    
Accounts receivable 15,000 363,000
Contract assets (141,000) (280,000)
Inventory (686,000) (146,000)
Other assets 375,000 (13,000)
Accounts payable 345,000 154,000
Earnout payable (500,000)
Accrued expenses (540,000) 212,000
Change in lease liability (127,000) (82,000)
Contract liabilities (171,000) (28,000)
Net cash used in operating activities (7,990,000) (5,092,000)
Cash flows from investing activities:    
Redemptions of short term investments 11,718,000 17,252,000
Purchases of short term investments (6,612,000) (10,813,000)
Purchase of property and equipment (133,000) (56,000)
Net cash provided by investing activities 4,973,000 6,383,000
Cash flows from financing activities:    
Cash paid for tax withholding related to shares withheld (2,000)
Net cash used in financing activities (2,000)
Net (decrease) / increase in cash, cash equivalents and restricted cash (3,019,000) 1,291,000
Cash, cash equivalents and restricted cash, beginning of period 7,103,000 8,362,000
Cash, cash equivalents and restricted cash, end of period 4,084,000 9,653,000
Supplemental disclosure of noncash investing and financing activities:    
Issuance of common stock for Marine Advanced Robotics earn out 1,000,000
Bonus paid through stock issuance $ 250,000