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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Operating activities:    
Net loss $ (393,000) $ (402,000)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 85,000 87,000
Provision for sales returns and doubtful accounts 8,000 3,000
Stock based compensation 10,000 14,000
Loss on investments 142,000 98,000
Changes in assets and liabilities:    
Trade accounts receivable (123,000) (91,000)
Inventory (80,000) 457,000
Prepaid expenses and other current assets (27,000) (33,000)
Trade accounts payable 431,000 244,000
Accrued liabilities (6,000) (51,000)
Other assets and liabilities 1,000 (1,000)
Total adjustments 441,000 727,000
Net cash provided by operating activities 48,000 325,000
Investing activities:    
Acquisition of property & equipment 0 (8,000)
Net cash used for investing activities 0 (8,000)
Impact of exchange rates on cash (6,000) 1,000
Net increase in cash and cash equivalents 42,000 318,000
Cash and cash equivalents, beginning of period 3,470,000 2,724,000
Cash and cash equivalents, end of period 3,512,000 3,042,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 26,000 26,000
Cash paid for income taxes, net $ 12,000 $ 2,000