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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, 2024
Sep. 30, 2023
Current maturities of long-term debt $ 125,000 $ 10,975,000
Reported Value Measurement [Member]    
Current maturities of long-term debt 125,000 10,975,000
Notes payable 136,175,000 126,100,000
Total Liabilities fair value 136,300,000 137,075,000
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 125,000 10,975,000
Notes payable 133,558,830 120,298,658
Total Liabilities fair value $ 133,683,830 $ 131,273,658