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Selected Quarterly Data (Unaudited) (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 27, 2014 | Jan. 26, 2014 | Oct. 27, 2013 | Jul. 28, 2013 | Apr. 28, 2013 | Jan. 27, 2013 | Oct. 28, 2012 | Jul. 29, 2012 | Apr. 27, 2014 | Apr. 28, 2013 | Apr. 29, 2012 | May 01, 2011
INCOME STATEMENT DATA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
net sales | $ 74,043 |  | $ 72,389 |  | $ 70,589 |  | $ 70,141 |  | $ 70,375 |  | $ 63,695 |  | $ 65,560 |  | $ 69,184 |  | $ 287,162 |  | $ 268,814 |  | $ 254,443 |
cost of sales | 62,282 |  | 60,552 |  | 58,354 |  | 57,067 |  | 57,527 |  | 52,010 |  | 53,683 |  | 56,064 |  | 238,256 |  | 219,284 |  | 214,711 |
gross profit | 11,761 |  | 11,837 |  | 12,235 |  | 13,074 |  | 12,848 |  | 11,685 |  | 11,877 |  | 13,120 |  | 48,906 |  | 49,530 |  | 39,732 |
selling, general and administrative expenses | 7,317 |  | 7,041 |  | 7,200 |  | 7,100 |  | 6,772 |  | 6,822 |  | 7,209 |  | 7,641 |  | 28,657 |  | 28,445 |  | 25,026 |
income from operations | 4,444 |  | 4,796 |  | 5,035 |  | 5,974 |  | 6,076 |  | 4,863 |  | 4,668 |  | 5,479 |  | 20,249 |  | 21,085 |  | 14,706 |
interest expense | 97 |  | 91 |  | 99 |  | 140 |  | 140 |  | 145 |  | 156 |  | 190 |  | 427 |  | 632 |  | 780 |
interest income | (139) |  | (148) |  | (102) |  | (92) |  | (90) |  | (105) |  | (96) |  | (127) |  | (482) |  | (419) |  | (508) |
other expense | 366 |  | 279 |  | 224 |  | 391 |  | 163 |  | 300 |  | 76 |  | 44 |  | 1,261 |  | 583 |  | 236 |
income before income taxes | 4,120 |  | 4,574 |  | 4,814 |  | 5,535 |  | 5,863 |  | 4,523 |  | 4,532 |  | 5,372 |  | 19,043 |  | 20,289 |  | 14,198 |
income taxes | 1,380 |  | (3,807) |  | 1,718 |  | 2,305 |  | 2,161 |  | 1,700 |  | (3,736) |  | 1,848 |  | 1,596 |  | 1,972 |  | 902 |
net income | 2,740 |  | 8,381 |  | 3,096 |  | 3,230 |  | 3,702 |  | 2,823 |  | 8,268 |  | 3,524 |  | 17,447 |  | 18,317 |  | 13,296 |
depreciation | 1,348 |  | 1,329 |  | 1,331 |  | 1,305 |  | 1,297 |  | 1,279 |  | 1,285 |  | 1,254 |  | 5,312 |  | 5,115 |  | 4,865 |
weighted average shares outstanding | 12,188,000 |  | 12,188,000 |  | 12,183,000 |  | 12,148,000 |  | 12,102,000 |  | 12,095,000 |  | 12,191,000 |  | 12,551,000 |  | 12,177,000 |  | 12,235,000 |  | 12,711,000 |
weighted average shares outstanding, assuming dilution | 12,413,000 |  | 12,405,000 |  | 12,389,000 |  | 12,366,000 |  | 12,323,000 |  | 12,290,000 |  | 12,348,000 |  | 12,711,000 |  | 12,414,000 |  | 12,450,000 |  | 12,866,000 |
PER SHARE DATA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
net income per share - basic | $ 0.22 |  | $ 0.69 |  | $ 0.25 |  | $ 0.27 |  | $ 0.31 |  | $ 0.23 |  | $ 0.68 |  | $ 0.28 |  | $ 1.43 |  | $ 1.50 |  | $ 1.05 |
net income per share - diluted | $ 0.22 |  | $ 0.68 |  | $ 0.25 |  | $ 0.26 |  | $ 0.30 |  | $ 0.23 |  | $ 0.67 |  | $ 0.28 |  | $ 1.41 |  | $ 1.47 |  | $ 1.03 |
book value | $ 9.12 |  | $ 8.93 |  | $ 8.29 |  | $ 8.05 |  | $ 7.82 |  | $ 7.52 |  | $ 7.81 |  | $ 7.26 |  |  |  |  |  |  |
BALANCE SHEET DATA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
operating working capital | 41,120 | [1] | 44,657 | [1] | 41,210 | [1] | 38,442 | [1] | 39,228 | [1] | 40,214 | [1] | 35,616 | [1] | 36,637 | [1] | 41,120 | [1] | 39,228 | [1] |  |
property, plant and equipment, net | 31,376 |  | 30,115 |  | 30,559 |  | 30,808 |  | 30,594 |  | 30,055 |  | 30,621 |  | 31,016 |  | 31,376 |  | 30,594 |  |  |
total assets | 160,935 |  | 156,678 |  | 156,242 |  | 151,101 |  | 144,706 |  | 143,797 |  | 142,443 |  | 143,160 |  | 160,935 |  | 144,706 |  | 144,716 |
capital expenditures | 2,643 |  | 927 |  | 1,082 |  | 658 |  | 1,863 |  | 713 |  | 890 |  | 991 |  | 5,258 |  | 4,400 |  | 5,890 |
long-term debt, current maturities of long-term debt, and line of credit | 4,986 | [2] | 4,973 | [2] | 4,985 | [2] | 7,160 | [2] | 7,161 | [2] | 7,342 | [2] | 7,692 | [2] | 9,900 | [2] | 4,986 | [2] | 7,161 | [2] |  |
shareholders' equity | 111,744 |  | 109,443 |  | 101,515 |  | 98,585 |  | 95,583 |  | 91,966 |  | 95,388 |  | 91,831 |  | 111,744 |  | 95,583 |  | 89,000 | 80,341
capital employed | $ 77,394 | [3] | $ 80,344 | [3] | $ 77,068 | [3] | $ 78,289 | [3] | $ 72,699 | [3] | $ 71,758 | [3] | $ 70,596 | [3] | $ 75,177 | [3] | $ 77,394 | [3] | $ 72,699 | [3] |  |
RATIOS & OTHER DATA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
gross profit margin | 15.90% |  | 16.40% |  | 17.30% |  | 18.60% |  | 18.30% |  | 18.30% |  | 18.10% |  | 19.00% |  |  |  |  |  |  |
operating income margin | 6.00% |  | 6.60% |  | 7.10% |  | 8.50% |  | 8.60% |  | 7.60% |  | 7.10% |  | 7.90% |  |  |  |  |  |  |
net income margin | 3.70% |  | 11.60% |  | 4.40% |  | 4.60% |  | 5.30% |  | 4.40% |  | 12.60% |  | 5.10% |  |  |  |  |  |  |
effective income tax rate | 33.50% |  | (83.20%) |  | 35.70% |  | 41.60% |  | 36.90% |  | 37.60% |  | (82.40%) |  | 34.40% |  | 8.40% |  | 9.70% |  | 6.40% |
Debt-to-total capital employed ratio | 6.40% | [2] | 6.20% | [2] | 6.50% | [2] | 9.10% | [2] | 9.90% | [2] | 10.20% | [2] | 10.90% | [2] | 13.20% | [2] | 6.40% | [2] | 9.90% | [2] |  |
operating working capital turnover | 7.0 | [1] | 7.0 | [1] | 7.1 | [1] | 7.1 | [1] | 7.4 | [1] | 7.9 | [1] | 8.3 | [1] | 8.5 | [1] |  |  |  |  |  |
days sales in receivables | 34 days |  | 31 days |  | 32 days |  | 29 days |  | 30 days |  | 32 days |  | 29 days |  | 24 days |  |  |  |  |  |  |
inventory turnover | 6.1 |  | 5.4 |  | 5.4 |  | 5.6 |  | 6.0 |  | 5.3 |  | 5.5 |  | 5.2 |  |  |  |  |  |  |
stock price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
high | $ 21.10 |  | $ 20.75 |  | $ 19.82 |  | $ 19.56 |  | $ 18.15 |  | $ 16.82 |  | $ 12.35 |  | $ 11.99 |  |  |  |  |  |  |
low | $ 17.61 |  | $ 18.37 |  | $ 17.60 |  | $ 14.93 |  | $ 14.76 |  | $ 12.00 |  | $ 9.75 |  | $ 9.00 |  |  |  |  |  |  |
close | $ 18.61 |  | $ 20.05 |  | $ 19.80 |  | $ 19.36 |  | $ 16.25 |  | $ 16.70 |  | $ 12.28 |  | $ 10.15 |  | $ 18.61 |  | $ 16.25 |  |  |
daily average trading volume (shares) | 27.1 |  | 26.9 |  | 21.2 |  | 34.7 |  | 51.9 |  | 43.4 |  | 29.9 |  | 38.6 |  |  |  |  |  |  |
[1] | Operating working capital for this calculation is accounts receivable and inventories, offset by accounts payable-trade and capital expenditures
[2] | Debt includes long-term debt, current maturities of long-term debt, and line of credit.
[3] | Capital employed represents long-term and current maturities of long-term debt, lines of credit, current and noncurrent deferred income tax liabilities, current and long-term income taxes payable, stockholders' equity, offset by cash and cash equivalents, short-term and long-term investments, current and noncurrent deferred income tax assets, and income taxes receivable.

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