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CONSOLIDATED STATEMENTS OF NET INCOME - USD ($)
$ 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
Income Statement [Abstract]                      
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, net 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 tax expense (note 9) 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
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