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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
 3 Months Ended 12 Months Ended
May 25, 2014
Feb. 23, 2014
Nov. 24, 2013
Aug. 25, 2013
May 26, 2013
Feb. 24, 2013
Nov. 25, 2012
Aug. 26, 2012
May 27, 2012
Feb. 26, 2012
Nov. 27, 2011
Aug. 28, 2011
May 25, 2014
May 26, 2013
May 27, 2012
Summary of Unaudited Quarterly Results of Operations [Abstract]                              
Revenues $ 120,929 $ 126,379 $ 120,026 $ 109,479 $ 107,113 $ 117,867 $ 114,654 $ 102,074 $ 82,617 $ 80,064 $ 81,570 $ 73,301 $ 476,813 $ 441,708 $ 317,552
Gross profit 16,143 20,155 13,734 12,532 13,030 17,508 18,459 13,763 14,706 13,172 13,010 11,250 62,564 62,760 52,138
Net income $ 4,542 $ 6,400 $ 3,451 $ 4,752 $ 4,519 $ 4,789 $ 8,913 $ 4,366 $ 2,779 $ 4,765 $ 3,340 $ 1,812 $ 19,145 $ 22,587 $ 12,696
Net income per basic share (in Dollars per share) $ 0.17 $ 0.24 $ 0.13 $ 0.18 $ 0.17 $ 0.19 $ 0.35 $ 0.17 $ 0.11 $ 0.19 $ 0.13 $ 0.07 $ 0.72 $ 0.87 $ 0.49
Net income per diluted share (in Dollars per share) $ 0.17 $ 0.24 $ 0.13 $ 0.18 $ 0.17 $ 0.18 $ 0.34 $ 0.17 $ 0.11 $ 0.18 $ 0.13 $ 0.07 $ 0.71 $ 0.85 $ 0.49