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Note 9 - Stockholders' Equity - Cash Dividends Declared (Details) - $ / shares
3 Months Ended 6 Months Ended 9 Months Ended
May 31, 2025
May 31, 2025
May 31, 2024
Feb. 28, 2025
May 31, 2025
May 31, 2024
Amount, per share (in dollars per share)   $ 0.01 $ 0.07   $ 0.15 $ 0.21
O 2025 Q1 Dividends [Member]            
Declaration date       Oct. 16, 2024    
Amount, per share (in dollars per share)         $ 0.07  
Record date         Oct. 30, 2024  
Payable date         Nov. 13, 2024  
Declaration date       Oct. 16, 2024    
O 2024 Q1 Dividends [Member]            
Declaration date Oct. 18, 2023          
Amount, per share (in dollars per share)           $ 0.07
Record date           Nov. 01, 2023
Payable date           Nov. 15, 2023
Declaration date Oct. 18, 2023          
O, 2024, Q2, Dividends [Member]            
Declaration date Jan. 17, 2024          
Amount, per share (in dollars per share)           $ 0.07
Record date           Jan. 31, 2024
Payable date           Feb. 14, 2024
Declaration date Jan. 17, 2024          
O 2025 Q2 Dividends [Member]            
Declaration date       Jan. 15, 2025    
Amount, per share (in dollars per share)         $ 0.07  
Record date         Jan. 29, 2025  
Payable date         Feb. 12, 2025  
Declaration date       Jan. 15, 2025    
O, 2024, Q3, Dividends [Member]            
Declaration date           Apr. 17, 2024
Amount, per share (in dollars per share)           $ 0.07
Record date           May 01, 2024
Payable date           May 15, 2024
Declaration date           Apr. 17, 2024
O 2025 Q3 Dividends [Member]            
Declaration date         Apr. 16, 2025  
Amount, per share (in dollars per share)         $ 0.01  
Record date         Apr. 30, 2025  
Payable date         May 14, 2025  
Declaration date         Apr. 16, 2025