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Note 15 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)
Nov. 30, 2021
Aug. 31, 2021
Available for sale securities $ 4,634 $ 4,634
Fair Value, Inputs, Level 1 [Member]    
Available for sale securities 4,634 4,634
Fair Value, Inputs, Level 2 [Member]    
Available for sale securities 0 0
Fair Value, Inputs, Level 3 [Member]    
Available for sale securities $ 0 $ 0