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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2017
May 01, 2016
May 03, 2015
cash flows from operating activities:      
net income $ 22,334 $ 16,935 $ 15,071
adjustments to reconcile net income to net cash provided by operating activities:      
depreciation 7,085 6,671 5,773
amortization of other assets 244 170 187
stock-based compensation 3,358 2,742 786
excess tax benefit related to stock-based compensation (657) (841) (109)
deferred income taxes 4,667 4,192 3,179
gain on sale of equipment (131) (35) (78)
loss from investment in unconsolidated joint venture 23    
realized loss on sale of short-term investments 12 127  
foreign currency exchange losses (gains) 78 (40) (84)
changes in assets and liabilities:      
accounts receivable (1,555) 4,476 (1,636)
inventories (5,437) (4,407) (1,883)
other current assets (495) (206) (151)
other assets 30 (46) (117)
accounts payable-trade 5,828 (3,785) 1,964
accrued expenses and deferred compensation 563 751 3,372
income taxes (2,966) 91 (163)
net cash provided by operating activities 32,981 26,795 26,111
cash flows from investing activities:      
capital expenditures (11,858) (11,475) (10,461)
investment in unconsolidated joint venture (1,129)    
purchase of short-term investments (44) (104) (5,355)
proceeds from the sale of short-term investments 2,000 5,612 1,628
purchase of long-term investments (held-to-maturity) (31,020)    
purchase of long-term investments (rabbi trust) (1,351) (1,649) (1,650)
proceeds from life insurance policies     320
payments on life insurance policies (18) (18) (18)
proceeds from the sale of equipment 141 233 727
net cash used in investing activities (43,279) (7,401) (14,809)
cash flows from financing activities:      
proceeds from lines of credit 9,000 7,000  
payments on lines of credit (9,000) (7,000) (538)
payments on vendor-financed capital expenditures (1,050)    
payments on long-term debt   (2,200) (2,200)
debt issuance costs (2) (134)  
repurchases of common stock   (2,397) (745)
dividends paid (6,280) (8,140) (7,579)
proceeds from common stock issued 37 200 94
excess tax benefit related to stock options exercised 657 841 109
net cash used in financing activities (6,638) (11,830) (10,859)
effect of exchange rate changes on cash and cash equivalents (56) 498 (21)
(decrease) increase in cash and cash equivalents (16,992) 8,062 422
cash and cash equivalents at beginning of year 37,787 29,725 29,303
cash and cash equivalents at end of year $ 20,795 $ 37,787 $ 29,725