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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Operating activities:    
Net income(loss) $ 696,000 $ (3,118,000)
Adjustments to reconcile net income(loss) to net cash provided by operating activities:    
Depreciation and amortization 203,000 175,000
Provision for inventory reserves 180,000 3,640,000
Provision for sales returns and doubtful accounts 190,000 77,000
Stock based compensation 3,000 1,000
Loss on investments 162,000 224,000
Changes in assets and liabilities:    
Trade accounts receivable (935,000) (19,000)
Inventory (115,000) 320,000
Prepaid expenses and other current assets (7,000) 22,000
Trade accounts payable (9,000) (182,000)
Accrued liabilities 20,000 99,000
Other assets and liabilities 0 8,000
Total adjustments (308,000) 4,365,000
Net cash provided by operating activities 388,000 1,247,000
Investing activities:    
Acquisition of property & equipment (37,000) (4,000)
Payment for investment in securities (93,000) 0
Net cash used for investing activities (130,000) (4,000)
Financing activities:    
Payments on notes payables (500,000) (500,000)
Cash dividends (554,000) (414,000)
Proceeds from exercise of stock options 40,000 0
Net cash used for financing activities (1,014,000) (914,000)
Impact of exchange rates on cash (12,000) (3,000)
Net (decrease)increase in cash and cash equivalents (768,000) 326,000
Cash and cash equivalents, beginning of period 4,018,000 3,692,000
Cash and cash equivalents, end of period 3,250,000 4,018,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 43,000 42,000
Cash paid for income taxes, net $ 3,000 $ 1,000