CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income (loss)	$ 1,672	$ (734)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	248	281
Stock-based compensation expense	15	20
Unrealized and realized (gains) on marketable securities	(2,449)
Loss on disposal of property, plant and equipment		14
Gain on forgiveness of PPP loan		(186)
Adjustment to reconcile operating lease expense to cash paid	(7)	(15)
Deferred income taxes	(131)	519
Changes in operating assets and liabilities:
Accounts receivable	216	33
Inventories	(286)	66
Prepaid expenses and other assets	128	(7)
Accounts payable	(209)	88
Accrued liabilities	(179)	150
Accrued income taxes	67	2
Net cash provided by (used in) operating activities	(915)	231
Cash flows from investing activities:
Purchases of marketable securities	(6,027)	0
Proceeds from sales of marketable securities	8,476	0
Purchases of property, plant and equipment	(42)	(159)
Acquisition of SPEC and KWJ, net of cash acquired	(1,672)
Net cash provided by (used in) investing activities	735	(159)
Cash flows from financing activities:
Proceeds from issuance of preferred stock, net of $432 of issuance costs		4,568
Payment of dividends on preferred stock	(400)	(48)
Proceeds from issuance of common stock	50
Net cash provided by (used in) financing activities	(350)	4,520
Effect of exchange rate changes on cash	(161)	65
Net increase (decrease) in cash, cash equivalents, and restricted cash	(691)	4,657
Cash, cash equivalents and restricted cash, beginning of period	10,782	6,125
Cash, cash equivalents and restricted cash, end of period	10,091	10,782
Reconciliation of cash, cash equivalents and restricted cash, end of period:
Cash and cash equivalents, end of period	10,091	10,777
Restricted cash, end of period		5
Cash, cash equivalents and restricted cash, end of period	10,091	10,782
Supplemental disclosure of cash flow information:
Income taxes paid	272	138
Interest paid	0	0
Supplemental non-cash investing and financing activities:
Lease liabilities arising from obtaining right-of-use assets	$ 178	$ 50