Note 2 - Summary of Significant Accounting Policies - Warranty Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016
Balance at beginning of the period	$ 5,069	$ 3,408	$ 3,408
Additions charged to expense	903	877	5,069
Deductions for repairs and Replacements	(624)	(615)	(3,408)
Balance at end of the period	$ 5,348	$ 3,670	$ 5,069