Nature of Business and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($)	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Aug. 31, 2008	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2022	Mar. 31, 2021	Jun. 30, 2021
Intangible assets
Impairment of intangible asset				$ 1,852,000
Useful life				20 years
Amortization expense		$ 98,000	$ 106,000		$ 293,000	$ 319,000
Changes in intangible assets
Carrying value		13,848,000			13,848,000
Accumulated amortization		(9,450,000)			(9,450,000)
Net book value		4,398,000			4,398,000		$ 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 remaining period					16 years 3 months 18 days		16 years 10 months 24 days
Customer relationships [Member]
Intangible assets
Useful life	20 years
Changes in intangible assets
Carrying value		9,800,000			$ 9,800,000
Accumulated amortization		(9,096,000)			(9,096,000)
Net book value		704,000			704,000
Trade name
Changes in intangible assets
Carrying value		4,048,000			4,048,000
Accumulated amortization		(354,000)			(354,000)
Net book value		$ 3,694,000			$ 3,694,000