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Note 9 - Net Income Per Common Share (Details Textual)
3 Months Ended
Jun. 28, 2019
Jun. 03, 2019
Nov. 30, 2019
shares
Nov. 30, 2018
shares
Stockholders' Equity Note, Stock Split, Conversion Ratio 2 2    
Share-based Payment Arrangement, Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount     141,768 141,768