Sales of Assets Sale of Branch Properties (Details) - USD ($)									9 Months Ended
	Jun. 25, 2020	Jun. 24, 2020	Feb. 28, 2020	Jan. 28, 2020	Dec. 31, 2019	Dec. 23, 2019	Nov. 19, 2019	Aug. 28, 2019	Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale-leaseback transaction, rent expense, noncash									$ 50,000
Seattle Branch [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration								$ 7,900,000
Proceeds from sale of property held-for-sale, gross								7,300,000
Gain (loss) on sale of properties								$ 6,800,000
Indianapolis, Indiana Branch [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration							$ 250,000
Proceeds from sale of property held-for-sale, gross							186,000
Gain (loss) on sale of properties							$ (173,000)
Howard, California Branch [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration						$ 7,050,000
Proceeds from sale of property held-for-sale, gross						6,569,000
Gain (loss) on sale of properties						$ 2,016,000
Sale Leaseback Transaction, Term						5 years
Sale-leaseback transaction, rent expense, noncash						$ 28,000
Denver, Colorado Branch [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration									2,300,000
Proceeds from sale of property held-for-sale, gross					$ 2,075,000
Gain (loss) on sale of properties					$ 1,989,000
Sale Leaseback Transaction, Term					7 years
Sale-leaseback transaction, rent expense, noncash					$ 17,000
Casper, Wyoming Branch [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration									$ 385,000
Proceeds from sale of property held-for-sale, gross					355,000
Gain (loss) on sale of properties					$ 304,000
Tempe, Arizona [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration				$ 1,150,000
Proceeds from sale of property held-for-sale, gross				1,077,000
Gain (loss) on sale of properties				$ 841,000
Great Falls, Montana [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration			$ 385,000
Proceeds from sale of property held-for-sale, gross			356,000
Gain (loss) on sale of properties			$ 283,000
Fort Collins, Colorado [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration		$ 1,275,000
Proceeds from sale of property held-for-sale, gross		1,179,000
Gain (loss) on sale of properties		$ 1,112,000
Oxnard, California [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration	$ 1,650,000
Proceeds from sale of property held-for-sale, gross	1,545,000
Gain (loss) on sale of properties	$ 1,390,000