Note 7 - Warranty (Tables)

6 Months Ended

Jun. 30, 2014

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Liability [Table Text Block]

	Three Months Ended June 30,						Six Months Ended June 30,
	2014			2013			2014			2013
Beginning balance	$	322,328		$	245,269		$	335,533		$	240,621
Warranty provisions		(19,628	)		43,611			50,986			166,500
Warranty claims		(72,013	)		(48,330	)		(155,832	)		(166,571	)
Ending balance	$	230,687		$	240,550		$	230,687		$	240,550