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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Oct. 31, 2023
Oct. 31, 2022
Cash flows from operating activities:    
Net loss $ (14,252,000) $ (10,696,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of fixed assets 172,000 117,000
Foreign exchange gain 1,000
Amortization of intangible assets 80,000 79,000
Amortization of right of use asset 201,000 152,000
(Accretion of discount)/amortization of premium on investments (211,000) 191,000
Change in contingent consideration liability (86,000) (221,000)
Stock based compensation 673,000 632,000
Changes in operating assets and liabilities:    
Accounts receivable 229,000 (105,000)
Contract assets (174,000) 85,000
Inventory (1,502,000) (586,000)
Other assets (511,000) (2,180,000)
Accounts payable 802,000 (316,000)
Earnout payable (500,000)
Accrued expenses (2,000) 680,000
Change in lease liability (201,000) (166,000)
Contract liabilities (214,000) 1,333,000
Net cash used in operating activities (15,495,000) (11,001,000)
Cash flows from investing activities:    
Redemptions of short term investments 20,600,000 33,433,000
Purchases of short term investments (8,026,000) (20,108,000)
Purchases of property and equipment (698,000) (179,000)
Net cash provided by investing activities 11,876,000 13,146,000
Cash flows from financing activities:    
Cash paid for tax withholding related to shares withheld (2,000)
Proceeds from issuance of common stock - Cantor At The Market offering, net of issuance costs 29,000
Net cash provided by financing activities 27,000
Net (decrease) / increase in cash, cash equivalents and restricted cash (3,592,000) 2,145,000
Cash, cash equivalents and restricted cash, beginning of period 7,103,000 8,362,000
Cash, cash equivalents and restricted cash, end of period 3,511,000 10,507,000
Supplemental disclosure of noncash investing and financing activities:    
Issuance of common stock for Marine Advanced Robotics earnout 1,000,000
Bonus paid through stock issuance $ 250,000