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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $)
In Thousands
 3 Months Ended
Jul. 30, 2011
Jul. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 3,368 $ 2,442
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 4,584 4,995
Amortization 67 79
Amortization of premium/discount on marketable securities 51 0
Loss (gain) on sale of property and equipment 48 (72)
Stock-based compensation 867 827
Provision for doubtful accounts (260) (10)
Deferred income taxes, net (16) 0
Change in operating assets and liabilities 2,931 5,346
Net cash provided by operating activities 11,640 13,607
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (2,903) (1,670)
Purchases of marketable securities (5,264) 0
Proceeds from sales and maturities 2,485 0
Insurance recoveries on property and equipment 0 114
Proceeds from sale of property and equipment 26 145
Other investing activities, net 0 (1,792)
Net cash used in investing activities (5,656) (3,203)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings on notes payable 311 0
Proceeds from exercise of stock options 218 310
Excess tax benefits from stock-based compensation 3 10
Dividends paid (4,588) (4,121)
Net cash used in financing activities (4,056) (3,801)
EFFECT OF EXCHANGE RATE CHANGES ON CASH 77 29
INCREASE IN CASH AND CASH EQUIVALENTS 2,005 6,632
CASH AND CASH EQUIVALENTS:    
Beginning of period 54,308 63,603
End of period 56,313 70,235
Cash payments for:    
Interest 43 23
Income taxes, net of refunds (3,367) (5,123)
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 13 315
Purchase of property and equipment included in accounts payable $ 676 $ 253