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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:    
Net income (loss) $ 1,553 $ 1,564
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation expense 864 806
Change in the value of contingent consideration (31)  
Provision for losses on accounts receivable 485 1,190
Amortization of intangible assets 48 0
Amortization of financing fees 50 91
Issuance of common stock for services 20 79
Provision for obsolete inventory 573 149
Deferred rent (296) (221)
Employee stock-based compensation expense 166 267
Deferred tax benefit (168) (295)
Changes in operating assets and liabilities, net of business acquisitions:    
Accounts receivable (1,725) (4,865)
Inventory (2,070) (1,046)
Prepaid expenses 50 (148)
Deposits and other current assets (12) 3
Accounts payable (132) 876
Accrued liabilities (112) 724
Income taxes payable (137) 464
Net cash used in operating activities (879) (362)
Cash flows from investing activities:    
Purchases of equipment and inventory used for rental (1,321) (1,267)
Cash paid for domain name (18)  
Cash paid for acquisition of NeuroDyne (Note 5) (245)  
Net cash used in investing activities (1,584) (1,267)
Cash flows from financing activities:    
Net borrowings on line of credit 2,617 2,019
Deferred financing fees (2) (147)
Payments on notes payable and capital lease obligations (131) (104)
Issuance of common stock 13 48
Net cash provided by financing activities 2,497 1,816
Net increase in cash 34 187
Cash at the beginning of the period 789 602
Cash at the end of the period 823 789
Supplemental cash flow information:    
Interest paid 352 411
Income taxes paid (including interest and penalties) 1,127 911
Supplemental disclosure of non-cash investing and financing activities:    
Equipment acquired through note payable and capital lease   73
Common stock issuances for business acquisition 158  
Increase in contingent consideration for business acquisition 135  
Contribution of property and equipment by noncontrolling interest $ 10