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Note 8 - Stockholders' Equity (Details) - Stock Options Outstanding and Exercisable (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
May 25, 2014
May 26, 2013
May 27, 2012
May 25, 2014
Range 1 [Member]
May 25, 2014
Range 2 [Member]
May 25, 2014
Range 3 [Member]
May 25, 2014
Range 4 [Member]
May 25, 2014
Range 5 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                
Exercise price, lower limit       $ 5.63 $ 5.65 $ 6.35 $ 8.19 $ 5.63
Exercise price, upper limit       $ 5.63 $ 6.22 $ 7.50 $ 14.30 $ 14.30
Number of shares outstanding (in Shares)       287,219 321,085 230,056 377,500 1,215,860
Weighted average remaining contractual life       3 years 3 days 2 years 229 days 2 years 229 days 5 years 10 days 3 years 167 days
Weighted average exercise price, options oustanding $ 14.15 $ 12.80 $ 6.72 $ 5.63 $ 6.15 $ 6.76 $ 13.58 $ 8.45
Aggregate intrinsic value, options oustanding (in Dollars)       $ 1,832,457 $ 1,881,142 $ 1,207,945 $ 136,400 $ 5,057,944
Number of shares exercisable (in Shares)       287,219 321,085 214,612 161,694 984,610
Weighted average exercise price, options exercisable       $ 5.63 $ 6.15 $ 6.77 $ 12.94 $ 7.25
Aggregate intrinsic value, options exercisable (in Dollars)       $ 1,832,457 $ 1,881,142 $ 1,125,386 $ 106,400 $ 4,945,385