v3.26.1
Note 7 - Long-Term Debt (Details Textual) - USD ($)
9 Months Ended
Jun. 02, 2026
Sep. 05, 2025
Jun. 30, 2026
Sep. 30, 2025
Mar. 31, 2025
Apr. 03, 2023
Mar. 24, 2023
Aug. 20, 2021
Line of Credit Facility, Maximum Borrowing Capacity         $ 30,000,000   $ 20,000,000  
Regulatory Asset, Noncurrent     $ 5,291,256 $ 3,315,082        
Debt Instrument, Debt Covenant Ratio of Long-term Debt to Total Capitalization, Maximum     65.00%          
Debt Instrument, Debt Covenant, Ratio of Priority Debt to Total Assets, Maximum     15.00%          
Debt Instrument, Debt Covenant, Interest Coverage Ratio     1.5          
Deferred Gain (Loss) on Early Extinguishment of Debt [Member]                
Regulatory Asset, Noncurrent     $ 942,044 $ 1,027,684        
Regulatory Asset, Amortization Period (Year)     20 years          
Two Interest Rate Swaps [Member]                
Derivative, Notional Amount   $ 35,600,000            
Derivative, Fixed Interest Rate   5.061%            
Unsecured Delayed-draw Promissory Note [Member]                
Debt Instrument, Face Amount $ 15,000,000              
Debt Instrument, Basis Spread on Variable Rate 1.00%              
Debt Instrument, Origination Fee, Percentage 0.10%              
New Term Note 1 [Member]                
Debt Instrument, Face Amount   $ 38,600,000            
New Term Note 2 [Member]                
Debt Instrument, Face Amount   $ 15,000,000            
New Term Notes [Member]                
Debt Instrument, Basis Spread on Variable Rate   1.55%            
Debt Instrument, Origination Fee, Percentage   0.30%            
Debt Instrument, Annual Fee   0.10%            
MVP Southgate Note 1 [Member]                
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,850,000            
MVP Boost Note [Member]                
Line of Credit Facility, Maximum Borrowing Capacity   $ 3,650,000            
MVP Southgate Notes [Member]                
Debt Instrument, Basis Spread on Variable Rate   1.75%            
Debt Instrument, Origination Fee, Percentage   0.25%            
MVP Southgate Notes [Member] | Interest Rate Upon Meeting Milestones [Member]                
Debt Instrument, Basis Spread on Variable Rate   1.55%            
Unsecured Term Notes Payable, at 30-day SOFR Average 1.20% Due August 20, 2026 [Member]                
Debt Instrument, Face Amount               $ 15,000,000
Amended and Restated Delayed Term Note Entered September 24, 2021 [Member]                
Debt Instrument, Face Amount           $ 10,000,000    
Subsequent Letter of Commitment to Refinance [Member]                
Debt Instrument, Face Amount   $ 53,600,000            
One Point Eight Five Note [Member]                
Debt Instrument, Face Amount   1,850,000            
Three Point Six Five Note [Member]                
Debt Instrument, Face Amount   $ 3,650,000