Note 6 - Accrued Expenses - Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020
Accrued warranty	$ 6,639	$ 6,956
Compensation and benefits	6,179	6,001
Customer prepayments	3,699	1,698
Accrued sales commissions	1,473	1,289
Finance lease liabilities	242	239
Other accrued expenses	4,043	3,874
Total Accrued Expenses	22,567	20,433
Accrued Expenses [Member]
Accrued expenses (Current liabilities)	$ 292	$ 376