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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Operating activities:    
Net income $ 2,655,000 $ 927,000
Adjustments to reconcile net income to net cash (used for)provided by operating activities:    
Depreciation and amortization 61,000 89,000
Provision for sales returns and doubtful accounts 0 0
Stock based compensation 11,000 14,000
Forgiveness of PPP loan 0 (163,000)
Deferred income taxes (1,922,000) 0
Loss on short-term investments 444,000 0
Changes in assets and liabilities:    
Accounts receivable (183,000) (336,000)
Inventories 220,000 69,000
Prepaid expenses and other current assets (55,000) (74,000)
Accounts payable (1,009,000) 280,000
Accrued liabilities (466,000) 23,000
Other assets and liabilities 7,000 (1,000)
Total adjustments (2,892,000) (99,000)
Net cash (used for)provided by operating activities (237,000) 828,000
Investing activities:    
Acquisition of property and equipment (3,000) (16,000)
Purchase of short-term investments (1,029,000) 0
Net cash used for investing activities (1,032,000) (16,000)
Financing activities:    
Dividend payments (1,134,000) (466,000)
Proceeds from stock options exercised 208,000 46,000
Net cash used for financing activities (926,000) (420,000)
Impact of exchange rates on cash (5,000) (16,000)
Net (decrease)increase in cash and cash equivalents (2,200,000) 376,000
Cash and cash equivalents, beginning of period 5,974,000 6,652,000
Cash and cash equivalents, end of period 3,774,000 7,028,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 0 0
Cash paid for income taxes, net 386,000 4,000
Supplemental disclosures of non-cash financing activities:    
On June 4, 2021, PPP loan was forgiven in full by SBA $ 0 $ 163,200