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Note 9 - Fair Value Measurements - Summary of the Fair Value of Financial Assets and Liabilities Not Adjusted to Fair Value (Details) - USD ($)
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Current maturities of long-term debt $ 26,600,000 $ 800,000 $ 800,000
Reported Value Measurement [Member]      
Current maturities of long-term debt 26,600,000 800,000  
Notes payable 111,300,000 136,955,000  
Total Liabilities fair value 137,900,000 137,755,000  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]      
Current maturities of long-term debt 0 0  
Notes payable 0 0  
Total Liabilities fair value 0 0  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]      
Current maturities of long-term debt 0 0  
Notes payable 0 0  
Total Liabilities fair value 0 0  
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]      
Current maturities of long-term debt 26,713,928 800,000  
Notes payable 108,724,095 135,471,275  
Total Liabilities fair value $ 135,438,023 $ 136,271,275