Note 5 - Accrued Expenses - Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Accrued Expenses:
Compensation and benefits	$ 9,759	$ 11,983
Customer prepayments	1,061	1,053
Accrued sales commissions	2,314	2,792
Accrued warranty	7,560	5,069	$ 3,408
Other accrued expenses	5,375	4,444
Total Accrued Expenses	$ 26,069	$ 25,341