Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Accounts Receivable, after Allowance for Credit Loss, Current	$ 78,626	$ 77,681	$ 77,800
Cash, Uninsured Amount	3,300	2,300
Depreciation	$ 5,000	4,900
Standard Warranty Extended Term for Exceptions	10 years
Defined Contribution Plan, Cost	$ 2,300	2,500
Research and Development Expense	$ 3,500	$ 3,400
Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares	2,087,000	2,156,000
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ 100	$ (300)
Other Expense [Member]
Gain (Loss), Foreign Currency Transaction, before Tax	$ 300
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	20 years
Standard Warranty Term	5 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Standard Warranty Term	1 year
Leasehold Improvements [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	15 years