Note 1 - Summary of Accounting Policies - Changes in Warranty Reserve (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Balance at beginning of year	$ 2,086	$ 1,781	$ 1,911
Acquisitions and other charges	(29)	68	(86)
Warranty expense	1,083	2,007	1,783
Warranty claims	(1,222)	(1,770)	(1,827)
Balance at end of year	$ 1,918	$ 2,086	$ 1,781