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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Cash flows from operating activities:    
Net loss $ (833) $ (4,389)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 1,433 1,396
Bad debt provision (8) (2)
Stock-based compensation expense 368 366
Deferred income taxes (22) 72
Change in assets and liabilities:    
Receivables (209) (2,971)
Inventories (706) (1,603)
Income tax receivable 0 180
Accounts payable and other accrued expenses (6,412) 3,145
Deferred revenue 7,869 (72)
Other, net (2,066) (2,193)
Net cash used in operating activities (586) (6,071)
Cash flows from investing activities:    
Capital expenditures (919) (930)
Net cash used in investing activities (919) (930)
Cash flows from financing activities:    
Proceeds from short-term borrowings 4,431 28,641
Repayments on short-term borrowings (6,019) (21,774)
Proceeds from sale-leaseback financing transaction 13,456 0
Payments on sale-leaseback financing transaction (282) 0
Payments on long-term lease obligations (61) (10)
Net cash provided by financing activities 11,525 6,857
Effect of exchange rate changes on cash, cash equivalents and restricted cash (597) (55)
Increase (decrease) in cash, cash equivalents and restricted cash 9,423 (199)
Cash, cash equivalents and restricted cash, beginning of period 6,894 5,731
Cash, cash equivalents and restricted cash, end of period $ 16,317 $ 5,532