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Revenue Recognition and Contracts with Customers - Adoption (Details)		12 Months Ended
	Jul. 01, 2018 USD ($)	Jun. 30, 2021 USD ($) segment	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Revenue: Adoption
Operating segments (in segments) \| segment		1
Retained earnings		$ 93,312,000	$ 77,899,000
Provision for Income Taxes		2,514,000	2,261,000	$ 1,274,000
Refund liabilities		$ 4,277,000	$ 3,331,000
Difference between Revenue Guidance in Effect
Revenue: Adoption
Right to recover	$ 716,000
Retained earnings	(719,000)
Provision for Income Taxes	(191,000)
Refund liabilities	$ 1,627,000