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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:    
Net income $ 1,564 $ 350
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation expense 806 774
Provision for losses on accounts receivable 1,190 317
Amortization of financing fees 91 71
Issuance of common stock for services 79 79
Provision for obsolete inventory 149 23
Deferred rent (221) 1,129
Net loss on disposal of equipment   18
Employee stock-based compensation expense 267 267
Deferred tax benefit (295) (281)
Changes in operating assets and liabilities:    
Accounts receivable (4,865) (2,586)
Inventory (1,046) (1,559)
Prepaid expenses (148) (6)
Deposits and other current assets 3 17
Accounts payable 876 186
Accrued liabilities 724 338
Income taxes payable 464 198
Net cash used in operating activities (362) (665)
Cash flows from investing activities:    
Proceeds received in lease termination   108
Purchases of equipment and inventory used for rental (1,267) (672)
Net cash used in investing activities (1,267) (564)
Cash flows from financing activities:    
Net borrowings on line of credit 2,019 1,270
Deferred financing fees (147) (120)
Payments on capital lease obligations (104) (182)
Issuance of common stock 48  
Net cash provided by financing activities 1,816 968
Net increase (decrease) in cash 187 (261)
Cash at the beginning of the period 602 863
Cash at the end of the period 789 602
Supplemental cash flow information:    
Interest paid 411 112
Income taxes paid (including interest and penalties) 911 1,068
Supplemental disclosure of non-cash investing and financing activities:    
Equipment acquired through note payable and capital lease $ 73 $ 441