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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2025
Jul. 31, 2024
Cash flows from operating activities:    
Net loss $ (3,411) $ (1,855)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 8,436 8,048
Gain on sale/disposition of assets (43) (58)
Deferred income taxes 0 84
Stock-based compensation expense 1,892 1,854
Non-cash sublease income (442) (425)
Other, net (51) 5
Changes in operating assets and liabilities:    
Accounts receivable 14,559 11,307
Inventories (13,257) (29,315)
Prepaid expenses and other current assets (2,781) (4,066)
Income taxes (817) (688)
Accounts payable (6,429) (11,740)
Accrued payroll and incentives (1,371) (4,839)
Accrued profit sharing 0 59
Accrued expenses and deferred revenue (4,092) 526
Accrued warranty (127) (70)
Other assets 23 313
Other non-current liabilities (199) 45
Net cash used in operating activities (8,110) (30,815)
Cash flows from investing activities:    
Purchases of marketable securities (3,168) 0
Payments to acquire patents and software (54) (21)
Proceeds from sale of property and equipment 49 58
Payments to acquire property and equipment (4,291) (4,702)
Net cash used in investing activities (7,464) (4,665)
Cash flows from financing activities:    
Proceeds from loans and notes payable 20,000 30,000
Payments on finance lease obligation (46) (44)
Payments on notes and loans payable (5,000) 0
Payments to acquire treasury stock 0 (12,856)
Dividend distribution (5,855) (5,886)
Payment of employee withholding tax related to restricted stock units (792) (1,058)
Net cash provided by financing activities 8,307 10,156
Net decrease in cash and cash equivalents (7,267) (25,324)
Cash and cash equivalents, beginning of period 25,231 60,839
Cash and cash equivalents, end of period 17,964 35,515
Supplemental disclosure of cash flow information    
Interest, net of amounts capitalized 1,288 1,313
Income taxes 194 361
Supplemental Disclosure of Non-cash Investing and Financing Activities:    
Purchases of property and equipment included in accounts payable 3,056 1,824
Capital lease included in accrued expenses and finance lease payable $ 398 $ 570