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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jul. 27, 2013
Jul. 28, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 5,720 $ 6,678
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Depreciation 3,757 3,819
Amortization 65 57
Amortization of premium/discount on marketable securities 59 48
(Gain) loss on sale of property and equipment (31) 3
Share-based compensation 722 762
Excess tax benefits from share-based compensation (3) (2)
Provision for doubtful accounts 417 (281)
Deferred income taxes, net (400) 19
Change in operating assets and liabilities (14,924) 5,405
Net cash (used in) provided by operating activities (4,618) 16,508
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (4,042) (1,443)
Proceeds from sale of property and equipment 68 92
Purchases of marketable securities (1,187) (3,857)
Proceeds from sales or maturities of marketable securities 500 3,999
Acquisition, net of cash acquired (1,298) 0
Net cash used in investing activities (5,959) (1,209)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments on notes payable 0 (982)
Proceeds from exercise of stock options 293 58
Excess tax benefits from share-based compensation 3 2
Principal payments on long-term obligations 3,374 0
Dividends paid (5,097) (4,832)
Net cash used in financing activities (8,175) (5,754)
EFFECT OF EXCHANGE RATE CHANGES ON CASH 246 (128)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (18,506) 9,417
CASH AND CASH EQUIVALENTS:    
Beginning of period 40,628 29,423
End of period 22,122 38,840
Cash payments for:    
Interest 18 36
Income taxes, net 4,356 (85)
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 63 156
Purchases of property and equipment included in accounts payable 1,080 519
Contributions of common stock under the employee stock purchase plan $ 766 $ 732