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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Oct. 27, 2018
Oct. 28, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 13,180 $ 15,561
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 9,300 8,902
Gain on sale of property, equipment and other assets (93) (1,221)
Share-based compensation 1,263 1,341
Contingent consideration adjustment (956) 0
Equity in loss of affiliate 265 191
Provision for doubtful accounts 51 (21)
Deferred income taxes, net (85) 81
Change in operating assets and liabilities (368) (15,496)
Net cash provided by operating activities 22,557 9,338
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (9,833) (7,735)
Proceeds from sales of property, equipment and other assets 182 2,000
Purchases of marketable securities (9,209) 0
Proceeds from sales or maturities of marketable securities 12,034 10,802
Purchases of equity investment (854) (607)
Acquisitions, net of cash acquired 2,250 0
Net cash (used in) provided by investing activities (9,930) 4,460
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from exercise of stock options 57 511
Principal payments on long-term obligations (431) (1,027)
Dividends paid (6,252) (6,197)
Tax payments related to RSU issuances 246 311
Net cash used in financing activities (6,872) (7,024)
EFFECT OF EXCHANGE RATE CHANGES 73 113
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 5,828 6,887
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:    
Beginning of period 29,755 32,839
End of period 35,583 39,726
Cash payments for:    
Interest 84 134
Income taxes, net of refunds 954 6,934
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 97 48
Purchase of property and equipment included in accounts payable 2,348 1,312
Contributions of common stock under the ESPP $ 820 $ 820