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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Jan. 28, 2017
Jan. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 9,433 $ 4,991
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 13,941 12,562
Impairment loss of intangible assets 830 0
Loss (gain) on sale of property, equipment and other assets 23 (50)
Share-based compensation 2,204 2,244
Gain on sale of equity investee 0 119
Provision for doubtful accounts 898 (110)
Deferred income taxes, net (286) 860
Change in operating assets and liabilities 18,336 (17,878)
Net cash provided by operating activities 45,379 2,500
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (6,709) (13,389)
Proceeds from sale of property, equipment and other assets 166 111
Purchases of marketable securities (18,098) (18,273)
Proceeds from sales or maturities of marketable securities 14,594 19,069
Acquisitions, net of cash acquired (1,374) (2,183)
Proceeds from sale of equity method investments 0 377
Net cash used in investing activities (11,421) (14,288)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments on notes payable (8) (33)
Proceeds from exercise of stock options 343 610
Principal payments on long-term obligations (912) (15)
Dividends paid (10,566) (13,158)
Payments for common shares repurchased (1,825) 0
Tax payments related to RSU issuances (261) (303)
Net cash used in financing activities (13,229) (12,899)
EFFECT OF EXCHANGE RATE CHANGES ON CASH (680) (920)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 20,049 (25,607)
CASH AND CASH EQUIVALENTS:    
Beginning of period 28,328 57,284
End of period 48,377 31,677
Cash payments for:    
Interest 171 283
Income taxes, net of refunds 114 5,466
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 218 220
Purchase of property and equipment included in accounts payable 397 280
Contributions of common stock under the ESPP $ 840 $ 927