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Note 9 - Net (Loss) Income Per Common Share (Details Textual)
12 Months Ended
Jun. 28, 2019
Jun. 03, 2019
Aug. 31, 2020
shares
Aug. 31, 2019
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 (in shares)     1,127,968 141,768