Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net loss	$ (694)	$ (1,132)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities
Depreciation and amortization	125	127
(Gain) on sale or disposal of assets	(1,823)	(273)
Stock-based compensation	46	525
Realized loss on equity investments, net	1,824
Changes in operating assets and liabilities:
Accounts receivable	351	388
Inventories	677	332
Other inventory supplies	1	39
Prepaid expenses and other assets	346	(3)
Accounts payable	(406)	(143)
Accrued payroll	(19)	43
Accrued real estate taxes	(60)	(9)
Corporate income and franchise taxes	8	2
Advanced payments	(16)	(16)
Accrued and other current liabilities	(169)	(36)
Net cash provided by (used in) operating activities	191	(156)
Cash flows from investing activities
Purchase of property and equipment	(2)	(64)
Proceeds from sale or disposal of assets	4,769	273
Purchases of investments	(2,779)	(1,606)
Proceeds from sale of investments	1,666	536
Net cash provided by (used in) investing activities	3,654	(861)
Cash flows from financing activities
Taxes paid related to net share settlement of equity awards		(7)
Purchases of treasury stock	(2,399)	(501)
Net cash used in financing activities	(2,399)	(508)
Net effect of currency translation
Net increase (decrease) in cash, cash equivalents and restricted cash	1,446	(1,525)
Cash, cash equivalents and restricted cash, beginning of period	8,880	11,410
Cash, cash equivalents and restricted cash, end of period	$ 10,326	$ 9,885