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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jul. 28, 2013
Jul. 29, 2012
Income Taxes    
Federal taxes at the statutory rate $ (1,208) $ 2,122
State taxes 283 247
Permanent differences 259 256
Tax credits (262) (355)
Other 52 114
Valuation allowance 2,287 (1,066)
Income tax provision $ 1,411 $ 1,318