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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Aug. 03, 2019
Jul. 28, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 7,030 $ 4,574
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 4,383 4,488
Loss on sale of property, equipment and other assets (26) (69)
Share-based compensation 643 651
Equity in loss of affiliate 118 134
Provision for doubtful accounts 5 (29)
Deferred income taxes, net (40) (65)
Change in operating assets and liabilities (30,331) (19,944)
Net cash used in operating activities (18,218) (10,260)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (5,856) (4,727)
Proceeds from sales of property, equipment and other assets 73 106
Purchases of marketable securities 0 (1,986)
Proceeds from sales or maturities of marketable securities 14,510 9,181
Purchases of and loans to equity investment (455) (426)
Acquisitions, net of cash acquired 0 2,250
Net cash provided by (used in) investing activities 8,272 (102)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on long-term obligations (1,221) (458)
Dividends paid (2,250) (3,121)
Proceeds from exercise of stock options 0 57
Payments for common shares repurchased 1,187 0
Net cash used in financing activities (4,658) (3,522)
EFFECT OF EXCHANGE RATE CHANGES (37) 70
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (14,641) (13,814)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:    
Beginning of period 35,742 29,755
End of period 21,101 15,941
Cash payments for:    
Interest 33 59
Income taxes, net of refunds 491 614
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 0 58
Purchases of property and equipment included in accounts payable 786 833
Contributions of common stock under the ESPP 779 820
Contingent consideration related to acquisition $ 0 $ 1,316