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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating activities:    
Net income $ 440,000 $ 458,000
Adjustments to reconcile net income to net cash (used for) provided by operating activities:    
Depreciation and amortization 82,000 76,000
Provision for sales returns and doubtful accounts 4,000 3,000
Stock based compensation 9,000 2,000
Loss on investments 0 135,000
Changes in assets and liabilities:    
Accounts receivable (176,000) (384,000)
Inventories 241,000 444,000
Prepaid expenses and other current assets (43,000) (30,000)
Accounts payable (519,000) 138,000
Accrued liabilities (40,000) (68,000)
Other assets and liabilities (1,000) 11,000
Total adjustments (443,000) 327,000
Net cash (used for) provided by operating activities (3,000) 785,000
Investing activities:    
Acquisition of property and equipment (5,000) 0
Payment for investment in convertible securities (186,000) 0
Net cash used for investing activities (191,000) 0
Financing activities:    
Payments on notes payable 0 (500,000)
Dividend payments (343,000) (278,000)
Proceeds from stock options exercised 126,000 18,000
Net cash used for financing activities (217,000) (760,000)
Impact of exchange rates on cash 15,000 2,000
Net (decrease) increase in cash and cash equivalents (396,000) 27,000
Cash and cash equivalents, beginning of period 4,494,000 3,250,000
Cash and cash equivalents, end of period 4,098,000 3,277,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 0 9,000
Cash paid for income taxes, net $ 3,000 $ 3,000