Note 6 - Accrued Expenses - Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Accrued Expenses:
Compensation and benefits	$ 7,494	$ 11,983
Customer prepayments	1,269	1,053
Accrued sales commissions	2,695	2,792
Accrued warranty	5,961	5,069	$ 4,310	$ 3,408
Other accrued expenses	5,561	4,444
Total Accrued Expenses	$ 22,980	$ 25,341