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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net (loss) income $ (310) $ 320
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Depreciation expense 213 213
Change in the value of contingent consideration 4  
Provision for losses on uncollectible accounts receivable 136 63
Amortization of intangible assets 15  
Amortization of financing fees 13 12
Provision for obsolete inventory 17  
Deferred rent (93) (75)
Employee stock-based compensation expense 36 46
Deferred tax expense   19
Changes in operating assets and liabilities, net of business acquisition (in 2012):    
Accounts receivable 854 (721)
Inventory (181) (995)
Prepaid expenses (13) (11)
Deposit and other current assets (170) 24
Accounts payable (382) 335
Accrued liabilities (705) (47)
Income taxes payable (427) 47
Net cash used in operating activities (993) (770)
Cash flows from investing activities:    
Purchases of equipment (55) (76)
Change in inventory used for rental 247 (119)
Cash paid for acquisition   (145)
Net cash provided by (used in) investing activities 192 (340)
Cash flows from financing activities:    
Net borrowings from line of credit 696 1,096
Deferred financing fees   (2)
Payments on notes payable and capital lease obligations (37) (31)
Net cash provided by financing activities 659 1,063
Net decrease in cash (142) (47)
Cash at beginning of period 823 789
Cash at end of period 681 742
Supplemental cash flow information:    
Interest paid 113 62
Income taxes paid (including interest and penalties) 427 65
Supplemental disclosure of non-cash investing and financing activities:    
Common stock issuances for business acquisition   158
Increase in accounts payable for business acquisition   100
Increase in contingent consideration for business acquisition   135
Equipment acquired through capital lease $ 72