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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Oct. 31, 2023
Oct. 31, 2022
Cash flows from operating activities:    
Net income $ 5,616 $ 12,960
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:    
Depreciation and amortization 17,327 15,171
Loss/(gain) on sale/disposition of assets 682 (43)
Provision for recoveries on notes and accounts receivable (1) (13)
Stock-based compensation expense 2,759 2,605
Changes in operating assets and liabilities:    
Accounts receivable (4,619) 18,324
Inventories 13,827 (59,814)
Prepaid expenses and other current assets (4,953) (2,493)
Income taxes (5,178) (11,555)
Accounts payable 14,682 5,889
Accrued payroll and incentives 1,324 (329)
Accrued profit sharing (6,699) (7,915)
Accrued expenses and deferred revenue 2,859 307
Accrued warranty (92) (130)
Other assets 397 521
Other non-current liabilities (175) (1,650)
Net cash provided by/(used in) operating activities 37,756 (28,165)
Cash flows from investing activities:    
Payments to acquire patents and software (125) (256)
Proceeds from sale of property and equipment 45 85
Payments to acquire property and equipment (66,983) (39,419)
Net cash used in investing activities (67,063) (39,590)
Cash flows from financing activities:    
Proceeds from loans and notes payable 50,000 0
Payments on notes and loans payable (10,000) 0
Payments on finance lease obligation (681) (559)
Payments to acquire treasury stock (8,212) 0
Dividend distribution (11,080) (9,153)
Proceeds to acquire common stock from employee stock purchase plan 722 753
Payment of employee withholding tax related to restricted stock units (806) (1,039)
Net cash provided by/(used in) financing activities 19,943 (9,998)
Net decrease in cash and cash equivalents (9,364) (77,753)
Cash and cash equivalents, beginning of period 53,556 120,728
Cash and cash equivalents, end of period 44,192 42,975
Supplemental disclosure of cash flow information Cash paid for:    
Interest, net of amounts capitalized 1,725 1,089
Income taxes 7,353 15,721
Supplemental Disclosure of Non-cash Investing Activities:    
Purchases of property and equipment included in accounts payable 8,826 9,655
Capital lease included in accrued expenses and finance lease payable $ 694 $ 0