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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating activities:    
Net income $ 656,000 $ 49,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 157,000 138,000
Provision for sales returns and doubtful accounts 154,000 74,000
Stock based compensation 3,000 (1,000)
Loss on investments 107,000 196,000
Changes in assets and liabilities:    
Trade accounts receivable (502,000) (451,000)
Inventories (458,000) 891,000
Prepaid expenses and other current assets (112,000) (49,000)
Trade accounts payable 111,000 (241,000)
Accrued liabilities 77,000 147,000
Other assets and liabilities (3,000) 6,000
Total adjustments (466,000) 710,000
Net cash provided by operating activities 190,000 759,000
Investing activities:    
Acquisition of property & equipment (35,000) (6,000)
Investment in securities (93,000) 0
Net cash used for investing activities (128,000) (6,000)
Financing activities:    
Repayment on notes payable 0 (500,000)
Dividend payments (414,000) (276,000)
Proceeds from stock options exercised 40,000 0
Net cash used for financing activities (374,000) (776,000)
Impact of exchange rates on cash (14,000) (5,000)
Net decrease in cash and cash equivalents (326,000) (28,000)
Cash and cash equivalents, beginning of period 4,018,000 3,692,000
Cash and cash equivalents, end of period 3,692,000 3,664,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 32,000 42,000
Cash paid for income taxes, net $ 3,000 $ 1,000