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Note 6 - Line-of-credit - Available Borrowing Limits (Details) - USD ($)
Dec. 31, 2023
Oct. 01, 2023
Sep. 30, 2023
Sep. 30, 2022
Available Line of Credit     $ 13,000,000 $ 28,000,000
Line of Credit [Member]        
Available Line of Credit     $ 13,000,000  
Line of Credit [Member] | Forecast [Member]        
Available Line of Credit $ 25,000,000 $ 22,000,000