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Long-term debt - Senior credit facility (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2022
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2024
Long-term debt            
Reduction of interest expense   $ 38,000 $ 84,000 $ 155,000 $ 201,000  
Interest expense   1,211,000 1,297,000 3,807,000 3,997,000  
Amortization of deferred financing costs   $ 132,000 $ 128,000 $ 401,000 $ 385,000  
Interest rate swap            
Long-term debt            
Notional amount           $ 59,000,000
Minimum | Interest rate swap            
Long-term debt            
Fixed SOFR rate   3.40%   3.40%    
Maximum | Interest rate swap            
Long-term debt            
Fixed SOFR rate   4.40%   4.40%    
Weighted average | Interest rate swap            
Long-term debt            
Fixed SOFR rate   6.80%   6.80%    
Senior credit facility            
Long-term debt            
Debt instrument term 5 years          
Borrowing capacity $ 110,000,000          
Delayed-draw term loan            
Long-term debt            
Borrowing capacity 85,000,000          
Proceeds from issuance of senior credit facility       $ 64,000,000    
Term loan            
Long-term debt            
Proceeds from issuance of senior credit facility 5,000,000          
Revolving credit facility            
Long-term debt            
Borrowing capacity $ 20,000,000          
Credit facility interest rate   7.60%   7.60%    
Repricing period       3 months    
Delayed Draw Term Loan and Term Loan            
Long-term debt            
Weighted average interest rate   7.00%   7.00%    
Repricing period       3 months    
Floor rate   0.50%   0.50%    
Spread rate       2.65%    
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]       us-gaap:SecuredOvernightFinancingRateSofrMember    
Delayed Draw Term Loan and Term Loan | Minimum            
Long-term debt            
Spread rate       2.10%    
Delayed Draw Term Loan and Term Loan | Maximum            
Long-term debt            
Spread rate       2.85%