Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net income (loss)	$ (498)	$ (780)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities
Depreciation and amortization	84	85
(Gain)/loss on sale or disposal of assets	(1,823)	(151)
Stock-based compensation	13	471
Realized (gain) loss on equity investments, net	1,824
Changes in operating assets and liabilities:
Accounts receivable	474	204
Inventories	474	189
Other inventory supplies	(1)	44
Prepaid expenses and other assets	232	(76)
Accounts payable	(378)	(30)
Accrued payroll	3	37
Accrued real estate taxes	(43)	5
Corporate income and franchise taxes	(1)	(7)
Advanced payments	(16)	(22)
Accrued and other current liabilities	(132)	(54)
Net cash provided by (used in) operating activities	212	(85)
Cash flows from investing activities
Purchase of property and equipment	(2)	(48)
Proceeds from sale or disposal of assets	4,773	151
Purchases of investments	(2,769)	(1,354)
Proceeds from sale of investments	1,660	235
Net cash provided by (used in) investing activities	3,662	(1,016)
Cash flows from financing activities
Taxes paid related to net share settlement of equity awards		(2)
Purchases of treasury stock	(1,868)	(501)
Net cash used in financing activities	(1,868)	(503)
Net effect of currency translation
Net decrease in cash, cash equivalents and restricted cash	2,006	(1,604)
Cash, cash equivalents and restricted cash, beginning of period	8,876	11,410
Cash, cash equivalents and restricted cash, end of period	$ 10,882	$ 9,806