Nature of Business and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Jun. 30, 2024
Intangible assets
Amortization expense	$ 79,000	$ 84,000	$ 236,000	$ 253,000
Changes in intangible assets
Carrying value	13,848,000		13,848,000		$ 13,848,000
Accumulated amortization	(10,482,000)		(10,482,000)		(10,246,000)
Net book value	3,366,000		3,366,000		$ 3,602,000
Future amortization expense
2026	297,000		297,000
2027	283,000		283,000
2028	269,000		269,000
2029	210,000		210,000
2030	202,000		$ 202,000
Weighted average remaining period			14 years 3 months 18 days		14 years 9 months 18 days
Customer relationships
Changes in intangible assets
Carrying value	9,800,000		$ 9,800,000		$ 9,800,000
Accumulated amortization	(9,521,000)		(9,521,000)		(9,436,000)
Net book value	279,000		279,000		364,000
Trade name
Changes in intangible assets
Carrying value	4,048,000		4,048,000		4,048,000
Accumulated amortization	(961,000)		(961,000)		(810,000)
Net book value	$ 3,087,000		$ 3,087,000		$ 3,238,000