Nature of Business and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2021
Intangible assets
Impairment of intangible asset			$ 1,852,000
Useful life			20 years
Amortization expense	$ 98,000	$ 107,000		$ 196,000	$ 213,000
Changes in intangible assets
Carrying value	13,848,000			13,848,000		$ 13,848,000
Accumulated amortization	(9,353,000)			(9,353,000)		(9,157,000)
Net book value	4,495,000			4,495,000		$ 4,691,000
Future amortization expense
2022	390,000			390,000
2023	361,000			361,000
2024	336,000			336,000
2025	315,000			315,000
2026	297,000			$ 297,000
Weighted average period				16 years 6 months		16 years 10 months 24 days
Customer relationships [Member]
Changes in intangible assets
Carrying value	9,800,000			$ 9,800,000		$ 9,800,000
Accumulated amortization	(9,049,000)			(9,049,000)		(8,955,000)
Net book value	751,000			751,000		845,000
Trade name
Changes in intangible assets
Carrying value	4,048,000			4,048,000		4,048,000
Accumulated amortization	(304,000)			(304,000)		(202,000)
Net book value	$ 3,744,000			$ 3,744,000		$ 3,846,000