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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Operating activities:    
Net income (loss) $ (286,000) $ 552,000
Adjustments to reconcile net income to net cash (used for) provided by operating activities:    
Depreciation and amortization 40,000 33,000
Stock based compensation 1,000 4,000
Deferred income taxes (1,000) (2,000)
Changes in values of marketable securities 401,000 (854,000)
Changes in assets and liabilities:    
Accounts receivable 202,000 (135,000)
Inventories 82,000 (73,000)
Prepaid expenses and other current assets (38,000) (70,000)
Accounts payable (191,000) 294,000
Accrued liabilities (116,000) (78,000)
Other assets and liabilities 0 1,000
Total adjustments 380,000 (880,000)
Net cash provided by (used for) operating activities 94,000 (328,000)
Investing activities:    
Acquisition of property and equipment (8,000) (37,000)
Proceeds from investment in securities 58,000 0
Net cash provided by (used for) investing activities 50,000 (37,000)
Financing activities:    
Dividend payments (301,000) (301,000)
Net cash used for financing activities (301,000) (301,000)
Impact of exchange rates on cash (14,000) 8,000
Net decrease in cash and cash equivalents (171,000) (658,000)
Cash and cash equivalents, beginning of period 4,208,000 6,205,000
Cash and cash equivalents, end of period 4,037,000 5,547,000
Supplemental disclosures of cash flow information:    
Cash paid for income taxes, net $ 0 $ 0