CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income	$ 190	$ 254
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	189	131
Unrealized and realized (gains) on marketable securities	0	(381)
Adjustment to reconcile operating lease expense to cash paid	5	(5)
Changes in operating assets and liabilities:
Accounts receivable	(273)	361
Inventories	(189)	(226)
Prepaid expenses and other assets	74	(56)
Accounts payable	85	74
Accrued liabilities	(198)	(210)
Accrued income taxes	(128)	86
Net cash provided by (used in) operating activities	(245)	28
Cash flows from investing activities:
Acquisition of Calman Technology Limited, net of cash acquired	(4,278)	0
Purchases of marketable securities	0	(6,027)
Purchases of property, plant and equipment	(32)	(9)
Net cash used in investing activities	(4,310)	(6,036)
Cash flows from financing activities:
Payment of dividends on preferred stock	(200)	(200)
Repurchases of common stock	(177)	0
Net cash used in financing activities	(377)	(200)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(53)	(167)
Net (decrease) in cash, cash equivalents and restricted cash	(4,985)	(6,375)
Cash, cash equivalents and restricted cash, beginning of period	10,091	10,782
Cash, cash equivalents and restricted cash, end of period	5,106	4,407
Reconciliation of cash, cash equivalents and restricted cash, end of period:
Cash and cash equivalents, end of period	5,106	4,402
Restricted cash, end of period	0	5
Cash, cash equivalents and restricted cash, end of period	5,106	4,407
Supplemental disclosure of cash flow information:
Income taxes paid	327	160
Interest paid	0	0
Supplemental disclosure of non-cash investing and financing activities:
Lease liabilities arising from obtaining right-of-use assets	$ 55	$ 178