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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Operating activities:    
Net income $ 514,000 $ 36,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 118,000 90,000
Provision for sales returns and doubtful accounts 148,000 69,000
Stock based compensation 2,000 (3,000)
Loss on investments 73,000 134,000
Changes in assets and liabilities:    
Trade accounts receivable (652,000) (639,000)
Inventories (114,000) 1,065,000
Prepaid expenses and other current assets (99,000) (66,000)
Trade accounts payable 90,000 (481,000)
Accrued liabilities (8,000) 91,000
Other assets and liabilities (2,000) 7,000
Total adjustments (444,000) 267,000
Net cash provided by operating activities 70,000 303,000
Investing activities:    
Acquisition of property & equipment (25,000) (6,000)
Investment in securities (93,000) 0
Net cash used for investing activities (118,000) (6,000)
Financing activities:    
Dividend payments (276,000) (138,000)
Proceeds from stock options exercised 40,000 0
Net cash used for financing activities (236,000) (138,000)
Impact of exchange rates on cash (27,000) (28,000)
Net decrease in cash and cash equivalents (311,000) 131,000
Cash and cash equivalents, beginning of period 4,018,000 3,692,000
Cash and cash equivalents, end of period 3,707,000 3,823,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 20,000 28,000
Cash paid for income taxes, net $ 3,000 $ 1,000