Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Loss from continuing operations	$ (459)	$ (723)
Adjustments to reconcile net loss from continuing operations to net cash used in continuing operations
Depreciation and amortization	140	152
Net gain on sale or disposal of assets and subsidiary	(613)	(2,084)
Realized loss on equity investments		1,824
Stock-based compensation	371	199
Changes in operating assets and liabilities:
Accounts receivable	(236)	257
Inventories	356	630
Other inventory supplies	6
Prepaid expenses and other assets	108	199
Accounts payable	19	(258)
Accrued payroll	215	159
Corporate income and franchise taxes	19	10
Accrued real estate taxes	7	(43)
Advance payments	(16)	2
Accrued and other current liabilities	22	(143)
Net cash provided by (used in) operating activities from continuing operations	(61)	181
Cash flows from discontinued operations	(262)	116
Cash flows from investing activities
Purchases of assets		(2)
Proceeds from sale or disposal of assets	643	4,909
Proceeds from sale or disposal of subsidiary		744
Purchase of investments	(6)	(2,782)
Proceeds from sale of investments	3	1,667
Net cash provided by investing activities	640	4,536
Cash flows from financing activities
Taxes paid related to net share settlement of equity awards	(187)	(48)
Purchases of treasury stock		(2,399)
Net cash used in financing activities	(187)	(2,447)
Net effect of currency translation		(136)
Net increase in cash and cash equivalents	130	2,250
Cash and cash equivalents, beginning of year	11,130	8,880
Cash and cash equivalents, end of year	$ 11,260	$ 11,130