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Selected Quarterly Data (Unaudited) (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 01, 2016 | Jan. 31, 2016 | Nov. 01, 2015 | Aug. 02, 2015 | May 03, 2015 | Feb. 01, 2015 | Nov. 02, 2014 | Aug. 03, 2014 | May 01, 2016 | May 03, 2015 | Apr. 27, 2014 | Apr. 28, 2013
INCOME STATEMENT DATA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
net sales |  | $ 77,253 | $ 78,466 | $ 76,956 | $ 80,185 | $ 78,846 | $ 81,269 | $ 73,991 | $ 76,060 | $ 312,860 |  | $ 310,166 |  | $ 287,162 |  |
cost of sales |  | 60,640 | 61,903 | 61,223 | 63,983 | 62,674 | 66,867 | 61,713 | 63,345 | 247,749 |  | 254,599 |  | 238,256 |  |
gross profit |  | 16,613 | 16,563 | 15,733 | 16,202 | 16,172 | 14,402 | 12,278 | 12,715 | 65,111 |  | 55,567 |  | 48,906 |  |
selling, general and administrative expenses |  | 9,261 | 9,337 | 9,433 | 8,741 | 9,605 | 8,375 | 7,379 | 7,419 | 36,773 |  | 32,778 |  | 28,657 |  |
income from operations |  | 7,352 | 7,226 | 6,300 | 7,461 | 6,567 | 6,027 | 4,899 | 5,296 | 28,338 |  | 22,789 |  | 20,249 |  |
interest expense |  |  |  |  | 24 | 15 |  |  | 68 |  |  | 64 |  | 427 |  |
interest income |  | (26) | (38) | (69) | (66) | (143) | (202) | (153) | (142) | (176) |  | (622) |  | (482) |  |
other expense (income) |  | 211 | 85 | 225 | 95 | 10 | 307 | 162 | (89) | 616 |  | 391 |  | 1,261 |  |
income before income taxes |  | 7,167 | 7,179 | 6,144 | 7,408 | 6,685 | 5,922 | 4,890 | 5,459 | 27,898 |  | 22,956 |  | 19,043 |  |
income taxes |  | 3,566 | 2,317 | 2,373 | 2,707 | 1,772 | 2,110 | 1,889 | 2,115 | 10,963 |  | 7,885 |  | 1,596 |  |
net income |  | 3,601 | 4,862 | 3,771 | 4,701 | 4,913 | 3,812 | 3,001 | 3,344 | 16,935 |  | 15,071 |  | 17,447 |  |
depreciation |  | $ 1,782 | $ 1,705 | $ 1,629 | $ 1,555 | $ 1,528 | $ 1,432 | $ 1,414 | $ 1,399 | $ 6,671 |  | $ 5,773 |  | $ 5,312 |  |
weighted average shares outstanding |  | 12,257,000 | 12,331,000 | 12,343,000 | 12,277,000 | 12,219,000 | 12,219,000 | 12,218,000 | 12,212,000 | 12,302,000 |  | 12,217,000 |  | 12,177,000 |  |
weighted average shares outstanding, assuming dilution |  | 12,434,000 | 12,486,000 | 12,484,000 | 12,456,000 | 12,440,000 | 12,417,000 | 12,401,000 | 12,404,000 | 12,475,000 |  | 12,422,000 |  | 12,414,000 |  |
PER SHARE DATA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
net income per share - basic |  | $ 0.29 | $ 0.39 | $ 0.31 | $ 0.38 | $ 0.40 | $ 0.31 | $ 0.25 | $ 0.27 | $ 1.38 |  | $ 1.23 |  | $ 1.43 |  |
net income per share - diluted |  | 0.29 | 0.39 | 0.30 | 0.38 | 0.39 | 0.31 | 0.24 | 0.27 | $ 1.36 |  | $ 1.21 |  | $ 1.41 |  |
dividends per share |  | 0.07 | 0.07 | 0.06 | 0.46 | 0.06 | 0.06 | 0.05 | 0.45 |  |  |  |  |  |  |
book value |  | $ 10.50 | $ 10.21 | $ 9.96 | $ 9.62 | $ 9.77 | $ 9.41 | $ 9.14 | $ 8.93 |  |  |  |  |  |  |
BALANCE SHEET DATA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
operating working capital | [1] | $ 45,794 | $ 49,288 | $ 43,303 | $ 43,405 | $ 41,829 | $ 39,371 | $ 37,645 | $ 41,265 | $ 45,794 |  | $ 41,829 |  |  |  |
property, plant and equipment, net |  | 39,973 | 38,157 | 38,319 | 37,480 | 36,078 | 35,269 | 33,204 | 31,891 | 39,973 |  | 36,078 |  |  |  |
total assets |  | 175,142 | 173,551 | 168,947 | 166,880 | 171,300 | 165,358 | 156,162 | 154,219 | 175,142 |  | 171,300 |  | $ 160,935 |  |
capital expenditures |  | 3,631 | 1,542 | 2,575 | 2,960 | 2,490 | 3,696 | 2,728 | 2,260 | 10,708 | [2] | 11,174 | [2] | 5,310 | [2] |
dividends paid |  | 859 | 864 | 741 | 5,676 | 733 | 733 | 611 | 5,502 | 8,140 |  | 7,579 |  | 2,204 |  |
long-term debt, current maturities of long-term debt, and line of credit | [3] |  |  |  | 2,200 | 2,200 | 2,200 | 2,200 | 4,969 |  |  | 2,200 |  |  |  |
shareholders' equity |  | 128,812 | 125,074 | 122,975 | 118,725 | 119,427 | 114,972 | 111,674 | 109,147 | 128,812 |  | 119,427 |  | $ 111,744 |  | $ 95,583
capital employed | [4] | $ 90,357 | $ 90,983 | $ 88,297 | $ 90,593 | $ 83,225 | $ 81,645 | $ 79,430 | $ 83,148 | $ 90,357 |  | $ 83,225 |  |  |  |
RATIOS & OTHER DATA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
gross profit margin |  | 21.50% | 21.10% | 20.40% | 20.20% | 20.50% | 17.70% | 16.60% | 16.70% |  |  |  |  |  |  |
operating income margin |  | 9.50% | 9.20% | 8.20% | 9.30% | 8.30% | 7.40% | 6.60% | 7.00% |  |  |  |  |  |  |
net income margin |  | 4.70% | 6.20% | 4.90% | 5.90% | 6.20% | 4.70% | 4.10% | 4.40% |  |  |  |  |  |  |
effective income tax rate |  | 49.80% | 32.30% | 38.60% | 36.50% | 26.50% | 35.60% | 38.60% | 38.70% | 39.30% |  | 34.30% |  | 8.40% |  |
Debt-to-total capital employed ratio | [3] | 0.00% | 0.00% | 0.00% | 240.00% | 260.00% | 270.00% | 280.00% | 600.00% | 0.00% |  | 260.00% |  |  |  |
operating working capital turnover | [1] | 700.00% | 720.00% | 770.00% | 770.00% | 770.00% | 750.00% | 720.00% | 710.00% |  |  |  |  |  |  |
days sales in receivables |  | 28 days | 31 days | 28 days | 29 days | 33 days | 32 days | 31 days | 31 days |  |  |  |  |  |  |
inventory turnover |  | 530.00% | 510.00% | 530.00% | 560.00% | 640.00% | 700.00% | 640.00% | 600.00% |  |  |  |  |  |  |
stock price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
high |  | $ 28.53 | $ 31.15 | $ 35.23 | $ 33.64 | $ 29.19 | $ 22.74 | $ 19.24 | $ 19.05 |  |  |  |  |  |  |
low |  | 22.72 | 22.61 | 29.13 | 25.22 | 19.22 | 18.50 | 16.60 | 17.11 |  |  |  |  |  |  |
close |  | $ 26.24 | $ 25.32 | $ 30.01 | $ 30.25 | $ 26.02 | $ 20.09 | $ 18.97 | $ 17.87 | $ 26.24 |  | $ 26.02 |  |  |  |
daily average trading volume (shares) |  | 33.5 | 68.8 | 76.2 | 90.5 | 64.9 | 26.8 | 29.7 | 33.7 |  |  |  |  |  |  |
[1] | Operating working capital for this calculation is accounts receivable and inventories, offset by accounts payable-trade accounts payable - capital expenditures.
[2] | Capital expenditure amounts are stated on an accrual basis. See Consolidated Statement of Cash Flows for capital expenditure amounts on a cash basis.
[3] | Debt includes long-term debt, current maturities of long-term debt, and line of credit.
[4] | Capital employed does not include cash and cash equivalents, short-term investments, long-term investments, current maturities of long-term debt, long-term debt, line of credit, noncurrent deferred tax assets and liabilities, income taxes receivable and payable, and deferred compensation.

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