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Note F - Warranty Obligations (Details) (USD $)	3 Months Ended
Note F - Warranty Obligations (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Note F - Warranty Obligations Details
Accrued warranty obligations, beginning	$ 68,000	$ 92,000
Actual warranty experience	9,000	14,000
Warranty provisions	9,000	14,000
Accrued warranty obligations, ending	$ 68,000	$ 92,000

- 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.

+ References+ Details