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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Jul. 29, 2017
Jul. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 8,429 $ 5,539
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Depreciation and amortization 4,460 4,600
(Gain) loss on sale of property, equipment and other assets (17) 31
Share-based compensation 672 709
Equity in loss of affiliate 85 0
Provision for doubtful accounts 14 7
Deferred income taxes, net 30 3
Change in operating assets and liabilities (18,586) (4,291)
Net cash (used in) provided by operating activities (4,913) 6,598
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (4,092) (2,157)
Proceeds from sale of property, equipment and other assets 63 64
Purchases of marketable securities 0 (2,394)
Proceeds from sales or maturities of marketable securities 7,643 6,856
Purchases of equity investment (607) 0
Net cash provided by investing activities 3,007 2,369
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments on notes payable 0 (4)
Proceeds from exercise of stock options 211 0
Principal payments on long-term obligations (1,018) (896)
Dividends paid (3,094) (4,409)
Payments for common shares repurchased 0 (1,825)
Net cash used in financing activities (3,901) (7,134)
EFFECT OF EXCHANGE RATE CHANGES ON CASH 52 (383)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (5,755) 1,450
CASH AND CASH EQUIVALENTS:    
Beginning of period 32,623 28,328
End of period 26,868 29,778
Cash payments for:    
Interest 103 104
Income taxes, net of refunds 1,586 50
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 48 73
Purchase of property and equipment included in accounts payable 797 209
Contributions of common stock under the ESPP $ 820 $ 0