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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Operating activities:    
Net income $ 184,000 $ 59,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 43,000 53,000
Provision for sales returns and doubtful accounts 3,000 2,000
Stock based compensation 4,000 1,000
Loss on investments 0 75,000
Changes in assets and liabilities:    
Accounts receivable 282,000 255,000
Inventories (103,000) 581,000
Prepaid expenses and other current assets (99,000) (45,000)
Accounts payable (6,000) (417,000)
Accrued liabilities (47,000) (80,000)
Other assets and liabilities (1,000) 9,000
Total adjustments 76,000 434,000
Net cash provided by operating activities 260,000 493,000
Investing activities:    
Acquisition of property & equipment (5,000) (3,000)
Payment for investment in convertible securities (186,000) 0
Net cash used for investing activities (191,000) (3,000)
Financing activities:    
Dividend payments (171,000) (139,000)
Proceeds from stock options exercised 76,000 0
Net cash used for financing activities (95,000) (139,000)
Impact of exchange rates on cash 13,000 (7,000)
Net (decrease) increase in cash and cash equivalents (13,000) 344,000
Cash and cash equivalents, beginning of period 4,494,000 3,250,000
Cash and cash equivalents, end of period 4,481,000 3,594,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 0 6,000
Cash paid for income taxes, net $ 0 $ 0