Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Income (loss) from continuing operations	$ 919	$ (459)
Adjustments to reconcile net income (loss) from continuing operations to net cash used in continuing operations
Depreciation and amortization	120	140
Gain on sale or disposal of assets	(1,410)	(613)
Gain on sale of equity investments	(18)
Other gain	(189)
Stock-based compensation	182	371
Changes in operating assets and liabilities:
Accounts receivable	41	(236)
Inventories	151	356
Other inventory supplies	(6)	6
Prepaid expenses and other assets	158	108
Grants receivable	(250)
Accounts payable	12	19
Accrued payroll	(298)	215
Corporate income and franchise taxes	(22)	19
Accrued real estate taxes	(11)	7
Advance payments	2	(16)
Accrued and other current liabilities	98	22
Net cash used in operating activities from continuing operations	(521)	(61)
Cash flows from discontinued operations		(262)
Cash flows from investing activities
Proceeds from sale or disposal of assets	1,954	643
Purchase of investments	(1,055)	(6)
Proceeds from sale of investments	15,823	3
Net cash provided by investing activities	16,722	640
Cash flows from financing activities
Proceeds from mortgage, net of escrow funding and loan costs	1,560
Mortgage loan principal payments	(9)
Taxes paid related to net share settlement of equity awards	(210)	(187)
Return of shareholder capital	(27,092)
Net cash used in financing activities	(25,751)	(187)
Net increase (decrease) in cash, cash equivalents and restricted cash	(9,550)	130
Cash, cash equivalents and restricted cash, beginning of year	11,260	11,130
Cash, cash equivalents and restricted cash, end of year	1,710	11,260
Supplemental disclosure of cash flow:
Cash paid for interest	$ 33