Note 1 - Summary of Significant Accounting Policies - Warranty Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Balance at beginning of the period	$ 5,069	$ 3,408
Additions charged to expense	4,956	5,069
Addition from acquired company	907
Deductions for repairs and replacements	(3,372)	(3,408)
Balance at end of the period	$ 7,560	$ 5,069