Note 7 - Warranty (Tables)

9 Months Ended

Sep. 30, 2014

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended September 30,						Nine Months Ended September 30,
	2014			2013			2014			2013
Beginning balance	$	230,687		$	240,550		$	335,533		$	240,621
Warranty provisions		111,868			134,327			156,855			300,827
Warranty claims		(101,980	)		(133,559	)		(251,813	)		(300,130	)
Ending balance	$	240,575		$	241,318		$	240,575		$	241,318