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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Jan. 31, 2023
Jan. 31, 2022
Cash flows from operating activities:    
Net loss $ (16,786,000) $ (13,721,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of fixed assets 157,000 104,000
Amortization of intangible assets 119,000 18,000
Amortization of right of use asset 230,000 211,000
Amortization of premium on short term investments 198,000
Change in contingent consideration liability 154,000 (60,000)
Gain on extinguishment of PPP Loan (890,000)
Share based compensation 911,000 864,000
Changes in operating assets and liabilities:    
Accounts receivable (224,000) 237,000
Contract assets 293,000 (217,000)
Inventory (995,000) (193,000)
Other assets (1,530,000) 51,000
Accounts payable (314,000) (165,000)
Accrued expenses 747,000 (589,000)
Change in lease liability (254,000) (228,000)
Contract liabilities 1,205,000 15,000
Litigation payable (1,224,000)
Net cash used in operating activities (16,089,000) (15,787,000)
Cash flows from investing activities:    
Redemptions of short term investments 49,584,000
Purchases of short term investments (30,402,000)
Payments for MAR acquisition, net of cash acquired (3,544,000)
Purchase of property, plant and equipment (302,000) (319,000)
Net cash provided by (used in) investing activities 18,880,000 (3,863,000)
Cash flows from financing activities:    
Acquisition of treasury stock for withholding taxes paid on vesting of restricted stock units (14,000)
Proceeds from issuance of common stock 90,000
Net cash (used in) provided by financing activities (14,000) 90,000
Effect of exchange rate changes on cash, cash equivalents and restricted cash (14,000)
Net increase / (decrease) in cash, cash equivalents and restricted cash 2,777,000 (19,574,000)
Cash, cash equivalents and restricted cash, beginning of period 8,362,000 83,634,000
Cash, cash equivalents and restricted cash, end of period 11,139,000 64,060,000
Supplemental disclosure of noncash investing and financing activities:    
Issuance of common stock in acquisition of MAR 5,855,000
Contingent liability 1,591,000
Advance Payable - MAR $ 456,000