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Description of Business, Basis of Presentation and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Intangible assets      
Amortization expense $ 74,000 $ 79,000  
Changes in intangible assets      
Carrying value 13,848,000   $ 13,848,000
Accumulated amortization (10,635,000)   (10,561,000)
Net book value 3,213,000   $ 3,287,000
Future amortization expense      
2027 283,000    
2028 269,000    
2029 210,000    
2030 202,000    
2031 $ 202,000    
Weighted average remaining period 13 years 10 months 24 days   14 years 1 month 6 days
Customer relationships      
Changes in intangible assets      
Carrying value $ 9,800,000   $ 9,800,000
Accumulated amortization (9,572,000)   (9,549,000)
Net book value 228,000   251,000
Trade name      
Changes in intangible assets      
Carrying value 4,048,000   4,048,000
Accumulated amortization (1,063,000)   (1,012,000)
Net book value $ 2,985,000   $ 3,036,000