Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jul. 01, 2019
Cash, Uninsured Amount	$ 2,300	$ 3,700
Depreciation, Total	5,200	6,000
Fair Value Disclosure, Off-balance Sheet Risks, Amount, Asset	$ 0
Standard Warranty Extended Term for Exceptions (Year)	10 years
Defined Contribution Plan, Cost	$ 1,400	1,300
Research and Development Expense, Total	$ 3,700	$ 3,600
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares (in shares)	1,029,000	368,000
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Ending Balance	$ (100)	$ 100
Operating Lease, Right-of-Use Asset	11,579	8,663
Operating Lease, Liability, Total	12,314	9,397
Retained Earnings (Accumulated Deficit), Ending Balance	(1,405)	(1,920)
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset			$ 10,400
Operating Lease, Liability, Total			10,800
Accounting Standards Update 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained Earnings (Accumulated Deficit), Ending Balance			$ 400
Other Expense [Member]
Foreign Currency Transaction Gain (Loss), before Tax, Total	$ 200	$ 500
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	20 years
Standard Warranty Term (Year)	5 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	5 years
Standard Warranty Term (Year)	1 year
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	15 years