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CONSOLIDATED STATEMENTS OF NET INCOME (UNAUDITED) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2016
Feb. 01, 2015
Jan. 31, 2016
Feb. 01, 2015
Income Statement [Abstract]        
Net sales $ 78,466 $ 81,269 $ 235,607 $ 231,320
Cost of sales 61,903 66,867 187,109 191,925
Gross profit 16,563 14,402 48,498 39,395
Selling, general and administrative expenses 9,337 8,375 27,512 23,173
Income from operations 7,226 6,027 20,986 16,222
Interest expense       50
Interest income (38) (202) (150) (478)
Other expense 85 307 405 380
Income before income taxes 7,179 5,922 20,731 16,270
Income taxes 2,317 2,110 7,398 6,113
Net income $ 4,862 $ 3,812 $ 13,333 $ 10,157
Net income per share, basic $ 0.39 $ 0.31 $ 1.08 $ 0.83
Net income per share, diluted $ 0.39 $ 0.31 $ 1.07 $ 0.82
Average shares outstanding, basic 12,331 12,219 12,317 12,216
Average shares outstanding, diluted 12,486 12,417 12,488 12,410