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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jan. 27, 2018
Jan. 28, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 9,372 $ 9,433
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 13,335 13,941
Impairment of intangible assets 0 830
(Gain) loss on sale of property, equipment and other assets (1,211) 23
Share-based compensation 1,978 2,204
Equity in loss of affiliate 401 78
Provision for doubtful accounts (55) 898
Deferred income taxes, net 3,429 (286)
Change in operating assets and liabilities (296) 18,266
Net cash provided by operating activities 26,953 45,387
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (10,865) (6,709)
Proceeds from sale of property, equipment and other assets 2,107 166
Purchases of marketable securities (5,211) (18,098)
Proceeds from sales or maturities of marketable securities 13,751 14,594
Purchases of equity investment (1,027) (1,374)
Net cash used in investing activities (1,245) (11,421)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments on notes payable 0 (8)
Proceeds from exercise of stock options 514 343
Principal payments on long-term obligations (1,036) (912)
Dividends paid (9,311) (10,566)
Payments for common shares repurchased 0 (1,825)
Tax payments related to RSU issuances (311) (261)
Net cash used in financing activities (10,144) (13,229)
EFFECT OF EXCHANGE RATE CHANGES 667 (680)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 16,231 20,057
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:    
Beginning of period 32,839 28,526
End of period 49,070 48,583
Cash payments for:    
Interest 161 171
Income taxes, net of refunds 7,449 114
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 72 218
Purchase of property and equipment included in accounts payable 1,163 397
Contributions of common stock under the ESPP $ 1,681 $ 840