Note 5 - Accrued Expenses - Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Accrued Expenses:
Compensation and benefits	$ 6,001	$ 5,319
Customer prepayments	1,698	1,768
Accrued sales commissions	1,289	1,301
Accrued warranty	6,956	7,687	$ 6,876
Finance lease liabilities	239
Other accrued expenses	3,874	5,136
Total Accrued Expenses	20,433	21,211
Accrued Expenses [Member]
Accrued Expenses:
Operating lease liabilities	$ 376