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Consolidated Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Operating activities:    
Net income $ 1,704,000 $ 3,139,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 109,000 81,000
Stock based compensation 4,000 18,000
Deferred income taxes (5,000) (1,922,000)
Changes in values of marketable securities (538,000) 511,000
Changes in assets and liabilities:    
Accounts receivable (442,000) (274,000)
Inventories 1,113,000 488,000
Prepaid expenses and other current assets (39,000) (69,000)
Accounts payable 21,000 (1,126,000)
Accrued liabilities 97,000 (508,000)
Other assets and liabilities 0 9,000
Total adjustments 320,000 (2,792,000)
Net cash provided by operating activities 2,024,000 347,000
Investing activities:    
Acquisition of property and equipment (204,000) 0
Purchase of marketable securities (1,000,000) (1,000,000)
Net cash used for investing activities (1,204,000) (1,000,000)
Financing activities:    
Dividend payments (901,000) (1,404,000)
Proceeds from stock options exercised 56,000 208,000
Net cash used for financing activities (845,000) (1,196,000)
Impact of exchange rates on cash 3,000 15,000
Net decrease in cash and cash equivalents (22,000) (1,834,000)
Cash and cash equivalents, beginning of period 5,217,000 5,974,000
Cash and cash equivalents, end of period 5,195,000 4,140,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 0 0
Cash paid for income taxes, net $ 499,000 $ 664,000