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Note 2 - Marketable Securities and Investment Other Securities (Details Textual) - USD ($)
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Apr. 07, 2022
Sep. 30, 2024
Sep. 30, 2023
Marketable Security, Gain (Loss)       $ 0 $ (700,000)
Steady State, LLC [Member]          
Equipment Sold Value     $ 1,800,000    
Investments, Total     $ 1,400,000    
Equity Method Investment, Other-than-Temporary Impairment $ 0 $ 700,000