10. Income Taxes (Details 1) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax asset:
Net operating loss carryover	$ 16,948	$ 25,240
Expenses capitalized under IRC 263(a)	37	56
Environmental liability	0	7
Tax credits (AMT)	57	0
Valuation allowance	(17,042)	(25,303)
Total tax asset	0	0
Deferred tax liability:
Net deferred tax asset	$ 0	$ 0