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Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Operating activities:    
Net loss $ (854) $ (849)
Adjustment to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 550 556
Stock compensation expense 139 150
Changes in assets and liabilities related to operations:    
Trade accounts receivable (1,090) (1,274)
Other accounts receivable (4) 1
Inventories 307 227
Prepaid expenses and other assets 121 (42)
Accounts payable 301 109
Accrued expenses (12) 232
Net cash used in operating activities (542) (890)
Investing activities:    
Acquisition of equipment and leasehold improvements (228) (352)
Payment of accounts payable incurred for the purchase of equipment and leasehold improvements (8) (23)
Net cash used in investing activities (236) (375)
Financing activities:    
Principal payments on capital leases (61) (23)
Proceeds from sale of short term investment   30
Proceeds from line of credit 450  
Principal payment on line of credit (250)  
Proceeds from exercise of stock options 26 0
Net cash provided by financing activities 165 7
Decrease in cash and cash equivalents (613) (1,258)
Cash and cash equivalents at beginning of period 1,862 3,276
Cash and cash equivalents at end of period 1,249 2,018
Supplemental cash flow information:    
Interest paid 9 $ 4
Supplemental non-cash investing activities:    
Accounts payable incurred for the purchase of equipment and leasehold improvements 28  
Capital lease obligations incurred in the purchase of equipment $ 65