Note 2 - Summary of Significant Accounting Policies - Warranty Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017
Balance at beginning of the period	$ 7,560	$ 5,069	$ 5,069
Additions charged to expense	927	903	4,956
Addition for acquired company			907
Deductions for repairs and replacements	(1,818)	(624)	(3,372)
Balance at end of the period	$ 6,669	$ 5,348	$ 7,560