Note 5 - Accrued Expenses - Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Accrued Expenses:
Compensation and benefits	$ 9,394	$ 9,759
Customer prepayments	1,070	1,061
Accrued sales commissions	2,274	2,314
Accrued warranty	6,876	7,560	$ 5,069
Other accrued expenses	4,658	5,375
Total Accrued Expenses	$ 24,272	$ 26,069