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Note 13 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)
Nov. 30, 2022
Aug. 31, 2022
Available for sale securities $ 5,590 $ 5,590
Fair Value, Inputs, Level 1 [Member]    
Available for sale securities 5,590 5,590
Fair Value, Inputs, Level 2 [Member]    
Available for sale securities 0 0
Fair Value, Inputs, Level 3 [Member]    
Available for sale securities $ 0 $ 0