Nature of Business and Summary of Significant Accounting Policies (Details)		12 Months Ended
	Jul. 01, 2019 USD ($)	Jun. 30, 2021 USD ($) segment shares	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($)
Accounting policies
Cash and cash equivalents, short term deposits		$ 63,000	$ 460,000
Common stock, outstanding (in shares) | shares		36,702,168	36,694,702
Allowance for doubtful accounts		$ 226,000	$ 326,000
Payment terms (in days)		30 and 180
Warranty term (in months)		24 to 36
Stock-Based Compensation
Number of share incentive programs		four
Stock based compensation expense		$ 435,000	583,000	$ 160,000
Foreign currency realized/unrealized gains(loss)		$ 0	0	$ 0
Segment Reporting
Operating segments (in segments) | segment		1
Leases
Lease, Practical Expedients, Package [true false]	true
Operating lease liability	$ 7,700,000
Operating lease asset	$ 7,700,000	$ 7,373,000	$ 7,395,000
Accounting Standards Update 2016-02
Leases
Lease, Practical Expedients, Package [true false]	true
Operating lease liability	$ 7,700,000
Operating lease asset	$ 7,700,000