Nature of Business and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2020
Intangible assets
Amortization expense	$ 106,000	$ 66,000	$ 319,000	$ 198,000
Changes in intangible assets
Carrying value	13,848,000		13,848,000		$ 13,848,000
Accumulated amortization	(9,051,000)		(9,051,000)		(8,732,000)
Net book value	4,797,000		$ 4,797,000		$ 5,116,000
Future amortization expense
Weighted average period			17 years		17 years 6 months
2021	426,000		$ 426,000
2022	391,000		391,000
2023	361,000		361,000
2024	337,000		337,000
2025	315,000		315,000
Customer relationships
Changes in intangible assets
Carrying value	9,800,000		9,800,000		$ 9,800,000
Accumulated amortization	(8,899,000)		(8,899,000)		(8,732,000)
Net book value	901,000		901,000		1,068,000
Trade name
Intangible assets
Impairment charge					$ 1,852,000
Useful life					20 years
Changes in intangible assets
Carrying value	4,048,000		4,048,000		$ 4,048,000
Accumulated amortization	(152,000)		(152,000)
Net book value	$ 3,896,000		$ 3,896,000		$ 4,048,000