CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income (loss)	$ (191)	$ 142
Adjustments to reconcile net income (loss) to net cash (used in) operating activities:
Depreciation and amortization	49	67
Unrealized (gains) on marketable securities	0	(156)
Adjustment to reconcile operating lease expense to cash paid	(1)	(3)
Changes in operating assets and liabilities:
Accounts receivable	(396)	(220)
Inventories	(208)	17
Prepaid expenses and other assets	(179)	35
Accounts payable	375	(4)
Accrued liabilities	(149)	(256)
Accrued income taxes	80	11
Net cash (used in) operating activities	(620)	(367)
Cash flows from investing activities:
Acquisition of Calman Technology Limited, net of cash acquired	(2,740)	0
Purchases of marketable securities	0	(2,179)
Purchases of property, plant and equipment	(10)	(6)
Net cash (used in) investing activities	(2,750)	(2,185)
Cash flows from financing activities:
Payment of dividends on preferred stock	(100)	(100)
Net cash (used in) financing activities	(100)	(100)
Effect of exchange rate changes on cash	69	5
Net decrease in cash and cash equivalents	(3,401)	(2,647)
Cash and cash equivalents, beginning of period	10,091	10,782
Cash and cash equivalents, end of period	6,690	8,135
Supplemental disclosure of cash flow information:
Income taxes paid, net	19	8
Interest paid	$ 0	$ 0