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Condensed Consolidated Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities:    
Net income $ 458,000 $ 514,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 76,000 118,000
Provision for sales returns and doubtful accounts 3,000 148,000
Stock based compensation 2,000 2,000
Loss on investments 135,000 73,000
Changes in assets and liabilities:    
Accounts receivable (384,000) (652,000)
Inventories 444,000 (114,000)
Prepaid expenses and other current assets (30,000) (99,000)
Accounts payable 138,000 90,000
Accrued liabilities (68,000) (8,000)
Other assets and liabilities 11,000 (2,000)
Total adjustments 327,000 (444,000)
Net cash provided by operating activities 785,000 70,000
Investing activities:    
Acquisition of property & equipment 0 (25,000)
Investment in securities 0 (93,000)
Net cash used for investing activities 0 (118,000)
Financing activities:    
Payments on notes payable (500,000) 0
Dividend payments (278,000) (276,000)
Proceeds from stock options exercised 18,000 40,000
Net cash used for financing activities (760,000) (236,000)
Impact of exchange rates on cash 2,000 (27,000)
Net increase (decrease) in cash and cash equivalents 27,000 (311,000)
Cash and cash equivalents, beginning of period 3,250,000 4,018,000
Cash and cash equivalents, end of period 3,277,000 3,707,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 9,000 20,000
Cash paid for income taxes, net $ 3,000 $ 3,000