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3. Allowance for Doubtful Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012
Allowance For Doubtful Accounts Details
Balance, beginning of year	$ 44	$ 44	$ 44	$ 39
Provision for doubtful accounts	(5)		17
Uncollectible accounts written off	(5)		(17)
Balance, end of year	$ 39	$ 44	$ 44

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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