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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Jul. 28, 2018
Jul. 29, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 4,574 $ 8,429
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 4,488 4,460
Gain on sale of property, equipment and other assets (69) (17)
Share-based compensation 651 672
Equity in loss of affiliate 134 85
Provision for doubtful accounts (29) 14
Deferred income taxes, net (65) 30
Change in operating assets and liabilities (19,944) (18,580)
Net cash used in operating activities (10,260) (4,907)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (4,727) (4,092)
Proceeds from sales of property, equipment and other assets 106 63
Purchases of marketable securities (1,986) 0
Proceeds from sales or maturities of marketable securities 9,181 7,643
Purchases of equity investment (426) (607)
Acquisitions, net of cash acquired 2,250 0
Net cash (used in) provided by investing activities (102) 3,007
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings on notes payable 3,000 0
Payments on notes payable (3,000) 0
Proceeds from exercise of stock options 57 211
Principal payments on long-term obligations (458) (1,018)
Dividends paid (3,121) (3,094)
Net cash used in financing activities (3,522) (3,901)
EFFECT OF EXCHANGE RATE CHANGES 70 52
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (13,814) (5,749)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:    
Beginning of period 29,755 32,839
End of period 15,941 27,090
Cash payments for:    
Interest 59 103
Income taxes, net of refunds 614 1,586
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 58 48
Purchase of property and equipment included in accounts payable 833 797
Contributions of common stock under the ESPP 821 820
Contingent consideration related to acquisition of AJT $ 1,316 $ 0