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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Operating activities:    
Net income $ 958,000 $ 1,293,000
Adjustments to reconcile net income to net cash (used for) provided by operating activities:    
Depreciation and amortization 76,000 76,000
Stock based compensation 7,000 6,000
Deferred income taxes (2,000) (5,000)
Changes in values of marketable securities (1,100,000) (538,000)
Changes in assets and liabilities:    
Accounts receivable (327,000) (275,000)
Inventories 192,000 596,000
Prepaid expenses and other current assets 119,000 (201,000)
Accounts payable (6,000) 285,000
Accrued liabilities (259,000) (117,000)
Other assets and liabilities 0 2,000
Total adjustments (1,300,000) (171,000)
Net cash (used for) provided by operating activities (342,000) 1,122,000
Investing activities:    
Acquisition of property and equipment (228,000) 0
Purchase of marketable securities 0 (1,000,000)
Net cash used for investing activities (228,000) (1,000,000)
Financing activities:    
Dividend payments (602,000) (600,000)
Net cash used for financing activities (602,000) (600,000)
Impact of exchange rates on cash (28,000) (2,000)
Net decrease in cash and cash equivalents (1,200,000) (480,000)
Cash and cash equivalents, beginning of period 6,205,000 5,217,000
Cash and cash equivalents, end of period 5,005,000 4,737,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 0 0
Cash paid for income taxes, net $ 203,000 $ 439,000