Nature of Business and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($)	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Intangible assets
Amortization expense	$ 337,000	$ 361,000	$ 391,000
Changes in intangible assets
Carrying value	13,848,000	13,848,000
Accumulated amortization	(10,246,000)	(9,909,000)
Net book value	3,602,000	$ 3,939,000
Future amortization expense
2025	315,000
2026	297,000
2027	283,000
2028	269,000
2029	$ 210,000
Weighted average remaining period	14 years 9 months 18 days	15 years 6 months
Customer relationships
Changes in intangible assets
Carrying value	$ 9,800,000	$ 9,800,000
Accumulated amortization	(9,436,000)	(9,302,000)
Net book value	364,000	498,000
Trade name
Changes in intangible assets
Carrying value	4,048,000	4,048,000
Accumulated amortization	(810,000)	(607,000)
Net book value	$ 3,238,000	$ 3,441,000