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Note 5 - Diluted Net Income Per Share (Details Textual) - shares
3 Months Ended 9 Months Ended
Feb. 28, 2016
Mar. 01, 2015
Feb. 28, 2016
Mar. 01, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,600,000 390,657 1,500,000 349,076