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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jul. 28, 2012
Jul. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 6,678 $ 3,368
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 3,819 4,584
Amortization 57 67
Amortization of premium/discount on marketable securities 48 51
Loss on sale of property and equipment 3 48
Stock-based compensation 762 867
Excess tax benefits from stock-based compensation (2) 0
Provision for doubtful accounts (281) (260)
Deferred income taxes, net 19 (16)
Change in operating assets and liabilities 5,405 2,931
Net cash provided by operating activities 16,508 11,640
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (1,443) (2,903)
Proceeds from sale of property and equipment 92 26
Purchases of marketable securities (3,857) (5,264)
Proceeds from sales or maturities of marketable securities 3,999 2,485
Net cash used in investing activities (1,209) (5,656)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings on notes payable 0 311
Payments on notes payable (982) 0
Proceeds from exercise of stock options 58 218
Excess tax benefits from stock-based compensation 2 3
Dividends paid (4,832) (4,588)
Net cash used in financing activities (5,754) (4,056)
EFFECT OF EXCHANGE RATE CHANGES ON CASH (128) 77
NET INCREASE IN CASH AND CASH EQUIVALENTS 9,417 2,005
CASH AND CASH EQUIVALENTS:    
Beginning of period 29,423 54,308
End of period 38,840 56,313
Cash payments (receipts) for:    
Interest 36 43
Income taxes, net of payments (85) (3,367)
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 156 13
Purchase of property and equipment included in accounts payable $ 519 $ 676