Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net loss	$ (807)	$ (2,209)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities
Depreciation and amortization	42	42
Unrealized (gain)/loss on equity investments		156
Realized (gain)/loss on equity investments		1,786
Stock-based compensation	341	11
Changes in operating assets and liabilities:
Accounts receivable	(4)	314
Inventories	27	316
Other inventory supplies	1	(1)
Prepaid expenses and other assets	31	29
Accounts payable	(187)	(291)
Accrued payroll	(58)	28
Accrued real estate taxes	19	19
Corporate income and franchise taxes	22	16
Advanced payments	(8)	(16)
Accrued and other current liabilities	184	(62)
Net cash provided by (cash used) by operating activities	(397)	138
Cash flows from investing activities
Purchases of investments	(1)	(1,720)
Proceeds from sale of investments	1	5,180
Net cash provided by investing activities		3,460
Cash flows from financing activities
Taxes paid related to net share settlement of equity awards	(162)
Purchases of treasury stock		(1,205)
Net cash used in financing activities	(162)	(1,205)
Net effect of currency translation
Net increase (decrease) in cash, cash equivalents and restricted cash	(559)	2,393
Cash, cash equivalents and restricted cash, beginning of period	11,130	8,880
Cash, cash equivalents and restricted cash, end of period	$ 10,571	$ 11,273