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Consolidated Statements of Cash Flows (unaudited) (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net loss $ (756,000) $ (160,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation 143,000 131,000
Loss on disposal of fixed assets 47,000 57,000
Provision for bad debts 34,000 225,000
Provision for obsolete inventory (104,000) 25,000
Stock-based compensation expense 92,000 117,000
(Increase) decrease in:    
Trade accounts receivable 2,626,000 1,502,000
Other accounts receivable 5,000 (23,000)
Inventory 1,077,000 (1,720,000)
Prepaids (1,247,000) 217,000
Other assets 52,000 (246,000)
Decrease in:    
Accounts payable (633,000) (191,000)
Accrued expenses (1,074,000) (755,000)
Net cash provided by (used in) operating activities 262,000 (821,000)
Cash flows from investing activities:    
Purchase of property and equipment (58,000) (144,000)
(Increase) decrease in restricted cash 1,003,000 (1,000)
Net cash provided by (used in) investing activities 945,000 (145,000)
Effect of exchange rate changes on cash (2,000) 43,000
Net increase (decrease) in cash and cash equivalents 1,205,000 (923,000)
Cash and cash equivalents, beginning of period 5,230,000 11,422,000
Cash and cash equivalents, end of period 6,435,000 10,499,000
Cash paid for interest      
Cash paid for income taxes