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Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating activities:    
Net income $ 762,000 $ 2,042,000
Adjustments to reconcile net income to net cash provided by (used for) operating activities:    
Depreciation and amortization 43,000 33,000
Provision for sales returns and doubtful accounts 0 1,000
Stock based compensation 2,000 5,000
Deferred income taxes (5,000) (1,922,000)
Changes in values of marketable securities (163,000) 87,000
Changes in assets and liabilities:    
Accounts receivable (521,000) 166,000
Inventories 730,000 198,000
Prepaid expenses and other current assets (78,000) (49,000)
Accounts payable (59,000) (1,421,000)
Accrued liabilities 231,000 (21,000)
Other assets and liabilities 0 7,000
Total adjustments 180,000 (2,916,000)
Net cash provided by(used for) operating activities 942,000 (874,000)
Investing activities:    
Acquisition of property and equipment (1,000) (5,000)
Purchase of marketable securities (1,000,000) 0
Net cash used for investing activities (1,001,000) (5,000)
Financing activities:    
Dividend payments (300,000) (264,000)
Net cash used for financing activities (300,000) (264,000)
Impact of exchange rates on cash (1,000) (17,000)
Net decrease in cash and cash equivalents (360,000) (1,160,000)
Cash and cash equivalents, beginning of period 5,217,000 5,974,000
Cash and cash equivalents, end of period 4,857,000 4,814,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 0 0
Cash paid for income taxes, net $ 0 $ 0