Note 6 - Accrued Expenses - Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Customer prepayments	$ 11,352	$ 1,698
Compensation and benefits	10,051	5,271
Accrued warranty	5,295	6,956	$ 7,687
Accrued sales commissions	2,568	1,289
Accrued FICA	1,190	730
Accrued income tax	434	0
Finance lease liabilities	263	239
Other accrued expenses	5,341	3,874
Total Accrued Expenses	37,918	20,433
Accrued Expenses [Member]
Accrued expenses (Current liabilities)	$ 1,424	$ 376