Summary of Significant Accounting Policies - Narrative (Details) shares in Millions	12 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) lease	Jun. 30, 2021 USD ($) shares	Jun. 30, 2021 USD ($) segment	Jun. 30, 2021 USD ($) region	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($) shares	Jun. 30, 2018 USD ($)	Jul. 01, 2019 USD ($)
Summary of Significant Accounting Policies Additional Information [Abstract]
Recorded bad debt expense		$ 0					$ 0	$ 0
Inventory valuation reserves	$ 500,000	500,000	$ 500,000	$ 500,000	$ 500,000	$ 500,000	200,000
Impairment of intangible assets		0					0
Research and development		700,000					$ 900,000	$ 1,100,000
Number of finance leases | lease			0
Number of antidilutive securities (in shares) | shares				0.1			0.1	0.2
Number of geographic segments					2	2
Accounting standards update	us-gaap:AccountingStandardsUpdate201602Member							us-gaap:AccountingStandardsUpdate201602Member	us-gaap:AccountingStandardsUpdate201602Member
Lease liabilities	$ 18,183,000	18,183,000	$ 18,183,000	$ 18,183,000	$ 18,183,000	$ 18,183,000
Right-of-use assets	13,700,000	13,700,000	13,700,000	13,700,000	13,700,000	13,700,000	$ 956,000
Stockholders' equity attributable to parent	$ 36,807,000	36,807,000	$ 36,807,000	$ 36,807,000	$ 36,807,000	$ 36,807,000	$ 33,254,000	$ 27,199,000	$ 21,947,000
Cumulative effect of adoption of accounting principle
Summary of Significant Accounting Policies Additional Information [Abstract]
Lease liabilities										$ 3,900,000
Right-of-use assets										3,300,000
Stockholders' equity attributable to parent								$ 508,000	$ (3,000)	$ 500,000
Cash Accounts Held Primarily At Financial Institution
Summary of Significant Accounting Policies Additional Information [Abstract]
Concentration of credit risk		17,200,000
Cash Accounts Held at Other Financial Institutions
Summary of Significant Accounting Policies Additional Information [Abstract]
Concentration of credit risk		$ 6,000,000.0