Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) - USD ($)	3 Months Ended	12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020
Goodwill and Other Intangible Assets
Impairment of goodwill		$ 14,160,000
Other intangible assets
Gross Carrying Amount	$ 52,458,000	52,299,000
Accumulated Amortization	(34,538,000)	(33,528,000)
Net Carrying Amount	17,920,000	18,771,000
Amortization expense of intangible assets	773,000	967,000
Amortization of deferred financing costs	124,000	116,000
Trademark and trade name
Other intangible assets
Gross Carrying Amount	5,486,000	5,486,000
Accumulated Amortization	(453,000)	(453,000)
Net Carrying Amount	5,033,000	5,033,000
Customer base and lists
Other intangible assets
Gross Carrying Amount	31,712,000	31,691,000
Accumulated Amortization	(20,286,000)	(19,612,000)
Net Carrying Amount	11,426,000	12,079,000
Non-compete agreements
Other intangible assets
Gross Carrying Amount	8,669,000	8,651,000
Accumulated Amortization	(8,286,000)	(8,226,000)
Net Carrying Amount	383,000	425,000
Deferred financing costs
Other intangible assets
Gross Carrying Amount	3,643,000	3,643,000
Accumulated Amortization	(2,893,000)	(2,769,000)
Net Carrying Amount	750,000	874,000
Other
Other intangible assets
Gross Carrying Amount	2,948,000	2,828,000
Accumulated Amortization	(2,620,000)	(2,468,000)
Net Carrying Amount	$ 328,000	$ 360,000