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Acquisitions of and investment in businesses (Details)
 12 Months Ended
Sep. 01, 2025
USD ($)
state
Jul. 01, 2025
USD ($)
state
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Acquisitions of and investment in businesses        
Acquisition-related costs     $ 817,000 $ 401,000
Acquired payment     21,824,000 $ 210,000
Mediserve Medical Equipment of Kingsport, Inc        
Acquisitions of and investment in businesses        
Number of states in which operations are based | state   2    
Total purchase price   $ 2,616,000 2,616,000  
Purchase price in cash   2,466,000 2,466,000  
Holdback payable   150,000 150,000  
Present value of hold back   $ 160,000    
Acquisition-related costs     173,000  
Pro forma revenues     6,600,000  
Pro forma net income (loss)     (100,000)  
Proforma revenue recognized     1,600,000  
Proforma net income (loss) recognized     0  
Interest acquired (in percent)   100.00%    
Net assets acquired     2,616,000  
Hart        
Acquisitions of and investment in businesses        
Number of states in which operations are based | state 2      
Total purchase price     19,358,000  
Purchase price in cash     20,633,000  
Acquisition-related costs     473,000  
Pro forma revenues     65,000,000  
Pro forma net income (loss)     (600,000)  
Proforma revenue recognized     5,700,000  
Proforma net income (loss) recognized     $ 400,000  
Interest acquired (in percent) 60.00%   60.00%  
Net assets acquired $ 30,939,000   $ 30,939,000  
Acquired payment 17,372,000      
Debt payoff $ 3,261,000