Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from continuing operating activities
Loss from continuing operations	$ (716)	$ (303)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	74	76
(Gain) on sale or disposal of assets	(370)	(1,823)
Stock-based compensation	371	13
Realized (gain) loss on equity investments, net		1,824
Changes in operating assets and liabilities:
Accounts receivable	(1)	270
Inventories	106	460
Other inventory supplies	2	(1)
Prepaid expenses and other assets	143	232
Accounts payable	(108)	(395)
Accrued payroll	63	3
Accrued real estate taxes	3	(43)
Corporate income and franchise taxes	11	1
Advanced payments	(18)	(16)
Accrued and other current liabilities	13	(134)
Net cash provided by (used in) continuing operating activities	(427)	164
Cash flows from discontinued operations	(190)	48
Cash flows from operating activities	(617)	212
Cash flows from investing activities
Purchase of property and equipment		(2)
Proceeds from sale or disposal of assets	370	4,773
Purchases of investments	(3)	(2,769)
Proceeds from sale of investments	1	1,660
Net cash provided by investing activities	368	3,662
Cash flows from financing activities
Taxes paid related to net share settlement of equity awards	(181)
Purchases of treasury stock		(1,868)
Net cash used in financing activities	(181)	(1,868)
Net increase (decrease) in cash, cash equivalents and restricted cash	(430)	2,006
Cash, cash equivalents and restricted cash, beginning of period	11,130	8,876
Cash, cash equivalents and restricted cash, end of period	$ 10,700	$ 10,882