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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Oct. 30, 2021
Oct. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 6,059 $ 10,883
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Depreciation and amortization 7,789 8,564
Gain on sale of property, equipment and other assets (676) (162)
Share-based compensation 1,012 1,047
Equity in loss of investees 1,565 1,145
Provision for doubtful accounts (588) 153
Deferred income taxes, net (41) 2
Change in operating assets and liabilities (23,654) 18,343
Net cash (used in) provided by operating activities (8,534) 39,975
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (4,507) (5,776)
Proceeds from sales of property, equipment and other assets 760 341
Proceeds from sales or maturities of marketable securities 0 247
Purchases of and loans to equity investees (6,129) (903)
Net cash used in investing activities (9,876) (6,091)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on long-term obligations (200) (220)
Proceed from exercise of stock options 3 0
Tax payments related to RSU issuances (199) (125)
Net cash used in financing activities (396) (345)
EFFECT OF EXCHANGE RATE CHANGES ON CASH 8 (498)
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (18,798) 33,041
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:    
Beginning of period 80,402 40,412
End of period 61,604 73,453
Supplemental disclosures of cash flow information:    
Interest 0 113
Income taxes, net of refunds 1,270 1,171
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 53 0
Purchases of property and equipment included in accounts payable 1,283 660
Contributions of common stock under the ESPP $ 597 $ 0