Note 6 - Accrued Expenses - Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
Accrued Expenses:
Compensation and benefits	$ 6,842	$ 9,394
Customer prepayments	1,476	1,070
Accrued sales commissions	1,702	2,274
Accrued warranty	7,136	6,876
Other accrued expenses	6,574	4,658
Total Accrued Expenses	$ 23,730	$ 24,272