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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:    
Net income $ (383) $ 1,672
Adjustments to reconcile net income (loss) to net cash (used in) operating activities:    
Depreciation and amortization 863 248
Unrealized and realized (gains) on marketable securities   (2,449)
Stock-based compensation expense 15 15
Adjustment to reconcile operating lease expense to cash paid 11 (7)
Deferred income taxes (83) (131)
Changes in operating assets and liabilities:    
Accounts receivable (291) 216
Inventories 284 (286)
Prepaid expenses and other assets (170) 128
Accounts payable 87 (209)
Accrued liabilities (184) (179)
Accrued income taxes (265) 67
Net cash (used in) operating activities (116) (915)
Cash flows from investing activities:    
Purchases of marketable securities 0 (6,027)
Proceeds from sales of marketable securities 0 8,476
Purchases of property, plant and equipment (123) (42)
Acquisition of Calman Technology Limited, net of cash acquired (4,873)  
Acquisition of SPEC and KWJ, net of cash acquired 111 (1,672)
Net cash used in investing activities (4,885) 735
Cash flows from financing activities:    
Payment of dividends on preferred stock (400) (400)
Repurchases of common stock (350)  
Issuance of common stock   50
Net cash used in financing activities (750) (350)
Effect of exchange rate changes on cash and cash equivalents (36) (161)
Net (decrease) in cash, cash equivalents, and restricted cash (5,787) (691)
Cash, cash equivalents and restricted cash, beginning of period 10,091 10,782
Cash, cash equivalents and restricted cash, end of period 4,304 10,091
Supplemental disclosure of cash flow information:    
Income taxes paid 487 272
Interest paid 0 0
Supplemental disclosure of non-cash investing and financing activities:    
Lease liabilities arising from obtaining right-of-use assets $ 55 $ 178