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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Apr. 28, 2019
Apr. 29, 2018
Apr. 30, 2017
Cash flows from operating activities:      
Net income $ 5,458 $ 20,877 $ 22,334
Adjustments to reconcile net income to net cash provided by operating activities:      
depreciation 8,117 7,672 7,085
amortization 780 351 244
stock-based compensation 130 2,212 3,358
deferred income taxes 2,027 (2,482) 4,667
gain on sale of equipment (1,452)   (131)
loss from investment in unconsolidated joint venture 114 266 23
realized loss on sale of short-term investments 94   12
foreign currency exchange (gains) losses (17) 66 78
changes in assets and liabilities, net of effects of acquisition of assets:      
accounts receivable 2,339 (299) (1,555)
inventories 3,841 (24) (5,437)
other current assets 41 226 (495)
other assets (65) (81) 30
accounts payable-trade (3,427) (4,028) 5,828
accrued expenses and deferred compensation (1,492) (1,562) 992
deferred revenue (410) (94)  
accrued restructuring costs 124    
income taxes (2,329) 4,373 (2,966)
net cash provided by operating activities 13,873 27,473 34,067
cash flows from investing activities      
net cash paid for acquisition of assets (12,096) (4,541)  
capital expenditures (3,261) (8,005) (11,858)
proceeds from the sale of equipment 1,894 6 141
investment in unconsolidated joint venture (120) (661) (1,129)
purchase of short-term investments (available for sale) (10) (49) (44)
proceeds from the sale of short-term investments (available for sale) 2,458   2,000
proceeds from the sale of short-term investments (held to maturity) 25,680    
purchase of long-term investments (held-to-maturity)     (31,020)
proceeds from the sale of long-term investments (rabbi trust) 1,233 57  
purchase of long-term investments (rabbi trust) (1,011) (1,902) (1,351)
proceeds from life insurance policy 394    
payments on life insurance policy   (18) (18)
net cash provided by (used in) investing activities 15,161 (15,113) (43,279)
cash flows from financing activities:      
proceeds from lines of credit 12,000 19,000 9,000
payments on lines of credit (12,000) (19,000) (9,000)
payments on vendor-financed capital expenditures (1,412) (3,750) (1,050)
proceeds from subordinated loan payable 675    
debt issuance costs (50)   (2)
repurchases of common stock (3,323)    
dividends paid (4,732) (6,843) (6,280)
common stock surrendered for withholding taxes payable (1,319) (1,530) (429)
proceeds from common stock issued   111 37
net cash used in financing activities (10,161) (12,012) (7,724)
effect of exchange rate changes on cash and cash equivalents (93) 85 (56)
increase (decrease) in cash and cash equivalents 18,780 433 (16,992)
cash and cash equivalents at beginning of year 21,228 20,795 37,787
cash and cash equivalents at end of year $ 40,008 $ 21,228 $ 20,795