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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Operating activities:    
Net income $ 209,000 $ 440,000
Adjustments to reconcile net income to net cash provided by (used for) operating activities:    
Depreciation and amortization 86,000 82,000
Provision for sales returns and doubtful accounts 5,000 4,000
Stock based compensation 13,000 9,000
Changes in assets and liabilities:    
Accounts receivable 454,000 (176,000)
Inventories (131,000) 241,000
Prepaid expenses and other current assets (24,000) (43,000)
Accounts payable 228,000 (519,000)
Accrued liabilities (78,000) (40,000)
Other assets and liabilities (1,000) (1,000)
Total adjustments 552,000 (443,000)
Net cash provided by (used for) operating activities 761,000 (3,000)
Investing activities:    
Acquisition of property and equipment (7,000) (5,000)
Payment for investment in convertible securities 0 (186,000)
Net cash used for investing activities (7,000) (191,000)
Financing activities:    
Proceeds from notes payable to bank 163,000 0
Dividend payments (404,000) (343,000)
Proceeds from stock options exercised 59,000 126,000
Net cash used for financing activities (182,000) (217,000)
Impact of exchange rates on cash (5,000) 15,000
Net increase (decrease) in cash and cash equivalents 567,000 (396,000)
Cash and cash equivalents, beginning of period 5,313,000 4,494,000
Cash and cash equivalents, end of period 5,880,000 4,098,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 0 0
Cash paid for income taxes, net $ 0 $ 3,000