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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
OPERATIONS:    
Net income (loss) $ (464,000) $ 983,000
Adjustments to reconcile net income (loss) to net cash used for operating activities:    
Depreciation and amortization 373,000 278,000
Stock-based compensation expense 59,000 27,000
Non-cash interest income, net (8,000) (12,000)
Equity in (income) loss of affiliate company 16,000 (3,000)
Changes in operating assets and liabilities    
Accounts receivable (318,000) (584,000)
Inventories (222,000) (161,000)
Other current assets (98,000) 63,000
Accounts payable (76,000) 76,000
Deferred revenue 43,000 (846,000)
Accrued payroll (23,000) (160,000)
Accrued expenses 60,000 81,000
Other current liabilities (102,000) (31,000)
Other liabilities (3,000) 64,000
Net cash used for operating activities (763,000) (225,000)
INVESTING ACTIVITIES:    
Purchase of marketable securities (41,000) (222,000)
Proceeds from note and interest receivable 250,000 600,000
Purchases of property and equipment (277,000) (382,000)
Long-term investment (300,000)  
Net cash used for investing activities (368,000) (4,000)
Effects of exchange rate changes on cash 7,000 (46,000)
Net decrease in cash (1,124,000) (275,000)
Cash at beginning of period 3,152,000 2,942,000
Cash at end of period 2,028,000 2,667,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid during the period for income taxes $ 15,000 $ 70,000