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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net income $ 1,151 $ 965
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation expense 647 594
Accretion of contingent consideration 14  
Provision for losses on uncollectible accounts receivable 325 1,190
Amortization of intangible assets 33  
Amortization of financing fees 37 36
Issuance of common stock for services 20 61
Provision for obsolete inventory 228 134
Deferred rent (222) (166)
Employee stock-based compensation expense 150 207
Deferred tax benefit (50) (216)
Changes in operating assets and liabilities net of business acquisition (Note 3):    
Accounts receivable (1,593) (4,637)
Inventory (2,291) (791)
Prepaid expenses 83 (1)
Deposits and other current assets 41 (47)
Accounts payable 264 848
Accrued liabilities 222 906
Income taxes payable (259) 142
Net cash used in operating activities (1,200) (775)
Cash flows from investing activities:    
Purchases of inventory used for rental and equipment (1,182) (1,123)
Cash paid for domain name (18)  
Cash paid for acquisition (245)  
Net cash used in investing activities (1,445) (1,123)
Cash flows from financing activities:    
Net borrowings from line of credit 2,788 2,110
Issuance of common stock 10 49
Deferred financing fees (2) (25)
Payments on capital lease obligations (97) (77)
Net cash provided by financing activities 2,699 2,057
Net increase in cash 54 159
Cash at beginning of period 789 602
Cash at end of period 843 761
Supplemental cash flow information:    
Interest paid 259 175
Income taxes paid 1,016 750
Supplemental disclosure of non-cash investing and financing activities:    
Equipment acquired through capital lease   77
Common stock issuances for business acquisition 158  
Increase in contingent consideration for business acquisition $ 135