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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2021
Aug. 01, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 3,685 $ 7,467
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Depreciation and amortization 4,052 4,337
Gain on sale of property, equipment and other assets (106) (53)
Share-based compensation 518 539
Equity in loss of affiliates 746 529
Provision for doubtful accounts (421) 1
Deferred income taxes, net (32) (4)
Change in operating assets and liabilities (9,461) (4,271)
Net cash (used in) provided by operating activities (1,019) 8,545
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (1,283) (3,155)
Proceeds from sales of property, equipment and other assets 149 86
Purchases of and loans to equity investment (718) (492)
Net cash used in investing activities (1,852) (3,561)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on long-term obligations (200) (210)
Net cash used in financing activities (200) (210)
EFFECT OF EXCHANGE RATE CHANGES ON CASH (132) (481)
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (3,203) 4,293
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:    
Beginning of period 80,402 40,412
End of period 77,199 44,705
Supplemental disclosures of cash flow information:    
Interest 0 43
Income taxes, net of refunds 980 786
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 46 0
Purchases of property and equipment included in accounts payable 868 969
Contributions of common stock under the ESPP $ 597 $ 0