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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Cash flows from operating activities:    
Net income $ 65,000 $ 260,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 266,000 192,000
Unrealized and realized (gains) on marketable securities 0 (562,000)
Stock-based compensation expense 15,000 15,000
Adjustment to reconcile operating lease expense to cash paid 11,000 (6,000)
Changes in operating assets and liabilities:    
Accounts receivable 229,000 121,000
Inventories (158,000) (318,000)
Prepaid expenses and other assets 103,000 (36,000)
Accounts payable (72,000) 33,000
Accrued liabilities (231,000) (154,000)
Accrued income taxes (73,000) 70,000
Net cash provided by (used in) operating activities 155,000 (385,000)
Cash flows from investing activities:    
Acquisition of Calman Technology Limited, net of cash acquired (4,278,000) 0
Purchases of marketable securities 0 (6,027,000)
Proceeds from sales of marketable securities 0 15,000
Purchases of property, plant and equipment (44,000) (9,000)
Net cash used in investing activities (4,322,000) (6,021,000)
Cash flows from financing activities:    
Payment of dividends on preferred stock (300,000) (300,000)
Repurchases of common stock (350,000) 0
Net cash used in financing activities (650,000) (300,000)
Effect of exchange rate changes on cash and cash equivalents (67,000) (187,000)
Net (decrease) in cash and cash equivalents (4,884,000) (6,893,000)
Cash and cash equivalents, beginning of period 10,091,000 10,782,000
Cash and cash equivalents, end of period 5,207,000 3,889,000
Supplemental disclosure of cash flow information:    
Income taxes paid 331,000 167,000
Interest paid 0 0
Supplemental disclosure of non-cash investing and financing activities:    
Lease liabilities arising from obtaining right-of-use assets $ 55,000 $ 178,000