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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows provided by (used for) operating activities:    
Net loss $ (229,000) $ (275,000)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 49,000 60,000
Provision for sales returns and doubtful accounts 6,000 16,000
Stock based compensation 6,000 4,000
Changes in assets and liabilities:    
Trade accounts receivable 377,000 105,000
Inventory 352,000 610,000
Prepaid expenses and other current assets (46,000) 0
Trade accounts payable (1,000) (197,000)
Accrued liabilities (64,000) (90,000)
Other assets and liabilities (6,000) (2,000)
Total adjustments 673,000 506,000
Net cash provided by operating activities 444,000 231,000
Cash flows provided by (used for) investing activities:    
Acquisition of property & equipment 0 (15,000)
Payments for investments in securities 0 (341,000)
All other investing activity (2,000) 1,000
Net cash used for investing activities (2,000) (355,000)
Impact of exchange rates on cash (1,000) 4,000
Net increase (decrease) in cash and cash equivalents 441,000 (120,000)
Cash and cash equivalents, beginning of period 2,475,000 1,905,000
Cash and cash equivalents, end of period 2,916,000 1,785,000
Supplemental disclosures of cash flow information:    
Cash paid for interest 13,000 13,000
Cash paid for income taxes, net $ 3,000 $ 3,000