Note 6 - Accrued Expenses - Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Jun. 30, 2020
Customer prepayments	$ 8,938	$ 1,698
Compensation and benefits	6,738	5,271
Accrued warranty	5,786	6,956
Accrued FICA	2,239	730
Accrued sales commissions	2,039	1,289
Finance lease liabilities	248	239
Other accrued expenses	4,010	3,874
Total Accrued Expenses	30,302	20,433
Accrued Expenses [Member]
Operating lease liabilities	$ 304	$ 376