Nature of Business and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Jun. 30, 2022
Intangible assets
Amortization expense	$ 90,000	$ 98,000	$ 271,000	$ 293,000
Changes in intangible assets
Carrying value	13,848,000		13,848,000		$ 13,848,000
Accumulated amortization	(9,819,000)		(9,819,000)		(9,548,000)
Net book value	4,029,000		4,029,000		$ 4,300,000
Future amortization expense
2023	361,000		361,000
2024	336,000		336,000
2025	315,000		315,000
2026	297,000		297,000
2027	283,000		$ 283,000
Weighted average remaining period			15 years 8 months 12 days		16 years 2 months 12 days
Customer relationships
Changes in intangible assets
Carrying value	9,800,000		$ 9,800,000		$ 9,800,000
Accumulated amortization	(9,262,000)		(9,262,000)		(9,143,000)
Net book value	538,000		538,000		657,000
Trade name
Changes in intangible assets
Carrying value	4,048,000		4,048,000		4,048,000
Accumulated amortization	(557,000)		(557,000)		(405,000)
Net book value	$ 3,491,000		$ 3,491,000		$ 3,643,000