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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.