3. Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Allowance For Doubtful Accounts Details
Balance, beginning of year	$ 49	$ 84
Provision for doubtful accounts	0	35
Uncollectible accounts written off	0	(70)
Balance, end of year	$ 49	$ 49