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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Aug. 01, 2015
Aug. 02, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 3,776 $ 8,745
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 4,020 3,625
Amortization 35 91
Amortization of premium/discount on marketable securities 33 49
Gain on sale of property, equipment and other assets (62) (1,132)
Share-based compensation 751 767
Excess tax benefits from share-based compensation (11) (11)
Provision for doubtful accounts 160 94
Deferred income taxes, net (21) 207
Change in operating assets and liabilities (18,763) 12,026
Net cash (used in) provided by operating activities (10,082) 24,461
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (7,232) (8,146)
Proceeds from sale of property, equipment and other assets 66 3,509
Purchases of marketable securities (9,506) (1,522)
Proceeds from sales or maturities of marketable securities 9,497 1,389
Acquisitions, net of cash acquired (614) (570)
Net cash used in investing activities (7,789) (5,340)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments on notes payable (9) 0
Proceeds from exercise of stock options 562 187
Excess tax benefits from share-based compensation 11 11
Principal payments on long-term obligations 8 21
Dividends paid (4,375) (4,323)
Net cash used in financing activities (3,819) (4,146)
EFFECT OF EXCHANGE RATE CHANGES ON CASH (325) 29
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (22,015) 15,004
CASH AND CASH EQUIVALENTS:    
Beginning of period 57,284 45,054
End of period 35,269 60,058
Cash payments for:    
Interest 126 151
Income taxes, net of refunds 3,215 4,420
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 4 26
Purchase of property and equipment included in accounts payable 883 2,327
Contributions of common stock under the employee stock purchase plan $ 0 $ 813