8. Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Deferred tax asset:
Net operating loss carryforward	$ 25,411	$ 25,240
Expenses capitalized under IRC 263(a)	56	56
Environmental liability	7	7
Valuation allowance	(25,474)	(25,303)
Total deferred tax asset	$ 0	$ 0