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Note 8 - Accrued Warranty (Detail) - Accrued Warranty (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Beginning Balance – January 1,	$ 354,000	$ 211,000
Charges for accruals in the current period	64,000	156,000
Reductions for warranty services provided		(13,000)
Ending Balance – December 31,	$ 418,000	$ 354,000

- Definition

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.

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