Note 6 - Accrued Expenses - Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016
Accrued Expenses:
Compensation and benefits	$ 6,867	$ 9,759
Customer prepayments	1,480	1,061
Accrued sales commissions	1,986	2,314
Accrued warranty	6,669	7,560	$ 5,348	$ 5,069
Other accrued expenses	6,502	5,375
Total Accrued Expenses	$ 23,504	$ 26,069