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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jan. 30, 2016
Jan. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 4,991 $ 17,043
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 12,381 11,056
Amortization 104 169
Amortization of premium/discount on marketable securities 77 132
Gain on sale of property, equipment and other assets (50) (1,192)
Share-based compensation 2,244 2,341
Gain on sale of equity investee 119 0
Excess tax benefits from share-based compensation (4) (35)
Provision for doubtful accounts (110) (295)
Deferred income taxes, net 860 353
Change in operating assets and liabilities (18,181) (2,255)
Net cash provided by operating activities 2,193 27,317
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (13,389) (15,328)
Proceeds from sale of property, equipment and other assets 111 4,011
Purchases of marketable securities (18,273) (10,647)
Proceeds from sales or maturities of marketable securities 19,069 10,256
Acquisitions, net of cash acquired (2,183) (6,223)
Proceeds from sale of equity method investment 377 0
Net cash used in investing activities (14,288) (17,931)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments on notes payable (33) (42)
Proceeds from exercise of stock options 610 2,424
Excess tax benefits from share-based compensation 4 35
Principal payments on long-term obligations (15) (1,185)
Dividends paid (13,158) (13,016)
Net cash used in financing activities (12,592) (11,784)
EFFECT OF EXCHANGE RATE CHANGES ON CASH (920) (905)
NET DECREASE IN CASH AND CASH EQUIVALENTS (25,607) (3,303)
CASH AND CASH EQUIVALENTS:    
Beginning of period 57,284 45,054
End of period 31,677 41,751
Cash payments for:    
Interest 283 256
Income taxes, net of refunds 5,466 9,961
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 220 69
Purchase of property and equipment included in accounts payable 280 1,025
Contributions of common stock under the employee stock purchase plan $ 927 $ 1,737