Note 6 - Accrued Expenses - Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Accrued warranty	$ 6,275	$ 6,956
Compensation and benefits	4,754	5,271
Customer prepayments	2,985	1,698
Accrued FICA	2,189	730
Accrued sales commissions	1,757	1,289
Finance lease liabilities	245	239
Other accrued expenses	4,234	3,874
Total Accrued Expenses	22,737	20,433
Accrued Expenses [Member]
Operating lease liabilities	$ 298	$ 376