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Note 15 - Quarterly Consolidated Financial Information (unaudited) (Details) - Summary of Unaudited Quarterly Results of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
May 26, 2013
May 27, 2012
May 29, 2011
Note 15 - Quarterly Consolidated Financial Information (unaudited) (Details) - Summary of Unaudited Quarterly Results of Operations [Line Items]      
Revenues $ 441,708 $ 317,552 $ 276,729
Gross profit 62,760 52,138 46,695
Net income 22,587 12,696 3,920
Net income per basic share (in Dollars per share) $ 0.87 $ 0.49 $ 0.15
Net income per diluted share (in Dollars per share) $ 0.85 $ 0.49 $ 0.15
First Quarter [Member]
      
Note 15 - Quarterly Consolidated Financial Information (unaudited) (Details) - Summary of Unaudited Quarterly Results of Operations [Line Items]      
Revenues 102,074 73,301 64,953
Gross profit 13,763 11,250 11,817
Net income 4,366 1,812 2,304
Net income per basic share (in Dollars per share) $ 0.17 $ 0.07 $ 0.09
Net income per diluted share (in Dollars per share) $ 0.17 $ 0.07 $ 0.09
Second Quarter [Member]
      
Note 15 - Quarterly Consolidated Financial Information (unaudited) (Details) - Summary of Unaudited Quarterly Results of Operations [Line Items]      
Revenues 114,654 81,570 70,168
Gross profit 18,459 13,010 11,855
Net income 8,913 3,340 2,055
Net income per basic share (in Dollars per share) $ 0.35 $ 0.13 $ 0.08
Net income per diluted share (in Dollars per share) $ 0.34 $ 0.13 $ 0.08
Third Quarter [Member]
      
Note 15 - Quarterly Consolidated Financial Information (unaudited) (Details) - Summary of Unaudited Quarterly Results of Operations [Line Items]      
Revenues 117,867 80,064 73,508
Gross profit 17,508 13,172 12,477
Net income 4,789 4,765 2,298
Net income per basic share (in Dollars per share) $ 0.19 $ 0.19 $ 0.09
Net income per diluted share (in Dollars per share) $ 0.18 $ 0.18 $ 0.09
Fourth Quarter [Member]
      
Note 15 - Quarterly Consolidated Financial Information (unaudited) (Details) - Summary of Unaudited Quarterly Results of Operations [Line Items]      
Revenues 107,113 82,617 68,100
Gross profit 13,030 14,706 10,546
Net income $ 4,519 $ 2,779 $ (2,737)
Net income per basic share (in Dollars per share) $ 0.17 $ 0.11 $ (0.10)
Net income per diluted share (in Dollars per share) $ 0.17 $ 0.11 $ (0.10)