Note 6 - Accrued Expenses - Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jun. 30, 2019
Accrued Expenses:
Compensation and benefits	$ 5,095	$ 5,319
Customer prepayments	1,443	1,768
Accrued sales commissions	1,556	1,301
Accrued warranty	7,464	7,687
Other accrued expenses	4,548	5,136
Total Accrued Expenses	$ 20,106	$ 21,211