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Note 7 - Warranty (Details) - Warranty Provisions and Claims (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Warranty Provisions and Claims [Abstract]
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)
Balance	$ 230,687	$ 240,550	$ 230,687	$ 240,550

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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