Nature of Business and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024
Intangible assets
Amortization expense	$ 79,000	$ 84,000
Changes in intangible assets
Carrying value	13,848,000		$ 13,848,000
Accumulated amortization	(10,325,000)		(10,246,000)
Net book value	3,523,000		$ 3,602,000
Future amortization expense
2026	297,000
2027	283,000
2028	269,000
2029	210,000
2030	$ 202,000
Weighted average remaining period	14 years 7 months 6 days		14 years 9 months 18 days
Customer relationships
Changes in intangible assets
Carrying value	$ 9,800,000		$ 9,800,000
Accumulated amortization	(9,465,000)		(9,436,000)
Net book value	335,000		364,000
Trade name
Changes in intangible assets
Carrying value	4,048,000		4,048,000
Accumulated amortization	(860,000)		(810,000)
Net book value	$ 3,188,000		$ 3,238,000