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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Operating activities:    
Net income $ 2,010,000 $ 1,359,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 180,000 186,000
Provision for inventory reserves 150,000 0
Reversal of inventory reserves (17,000) (1,134,000)
Provision for sales returns and doubtful accounts 1,000 5,000
Stock based compensation 29,000 27,000
Forgiveness of PPP loan (163,000) 0
Noncontrolling interest 0 (100,000)
Changes in assets and liabilities:    
Accounts receivable (262,000) 378,000
Inventories (1,876,000) 1,204,000
Prepaid expenses and other current assets (127,000) 39,000
Accounts payable 1,403,000 (52,000)
Accrued liabilities 478,000 124,000
Other assets and liabilities (4,000) 16,000
Total adjustments (208,000) 693,000
Net cash provided by operating activities 1,802,000 2,052,000
Investing activities:    
Acquisition of property and equipment (18,000) (17,000)
Purchase of short-term investments (1,566,000) 0
Net cash used for investing activities (1,584,000) (17,000)
Financing activities:    
Borrowings on notes payable 0 163,000
Dividend payments (965,000) (840,000)
Proceeds from stock options exercised 76,000 85,000
Net cash used for financing activities (889,000) (592,000)
Impact of exchange rates on cash (7,000) (104,000)
Net increase in cash and cash equivalents (678,000) 1,339,000
Cash and cash equivalents, beginning of period 6,652,000 5,313,000
Cash and cash equivalents, end of period 5,974,000 6,652,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 0 0
Cash paid for income taxes, net 4,000 3,000
Supplemental disclosure of non-cash information:    
On June 4, 2021, PPP loan was forgiven in full by SBA $ 163,000 $ 0