Note 2 - Summary of Significant Accounting Policies - Warranty Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016
Balance at beginning of the period	$ 5,069	$ 3,408	$ 3,408
Additions charged to expense	2,243	2,259	5,069
Deductions for repairs and Replacements	(1,351)	(1,357)	(3,408)
Balance at end of the period	$ 5,961	$ 4,310	$ 5,069