6. Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts payable and accrued expenses
Accounts payable	$ 15	$ 26
Accrued audit/tax expense	47	46
Accrued consulting fees-related party	1	1
Environmental remediation obligations	0	19
Accrued debenture fees	145	137
Accrued miscellaneous	1	1
Total	209	230
Accrued real estate taxes consisted of:
Current accrued real estate taxes	$ 4	$ 4