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Condensed Consolidated Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Operating activities:    
Net income (loss) $ (671,000) $ 1,203,000
Adjustments to reconcile net income to net cash provided by (used for) operating activities:    
Depreciation and amortization 160,000 133,000
Stock based compensation 2,000 9,000
Deferred income taxes (1,000) (2,000)
Changes in values of marketable securities (750,000) (1,282,000)
Changes in assets and liabilities:    
Accounts receivable (24,000) (531,000)
Inventories 851,000 (401,000)
Prepaid expenses and other current assets 81,000 146,000
Accounts payable 241,000 531,000
Accrued liabilities (547,000) (177,000)
Accrued restructuring reserve 1,256,000 0
Other assets and liabilities   (3,000)
Total adjustments 1,269,000 (1,577,000)
Net cash provided by (used for) operating activities 598,000 (374,000)
Acquisition of property and equipment (14,000) (228,000)
Net cash used for investing activities (14,000) (228,000)
Financing activities:    
Dividend payments (813,000) (903,000)
Net cash used for financing activities (813,000) (903,000)
Impact of exchange rates on cash (19,000) 8,000
Net decrease in cash and cash equivalents (248,000) (1,497,000)
Cash and cash equivalents, beginning of period 4,208,000 6,205,000
Cash and cash equivalents, end of period 3,960,000 4,708,000
Supplemental disclosures of cash flow information:    
Cash paid for income taxes, net $ 2,000 $ 203,000