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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities:    
Net income/(loss) $ (836) $ 69
Adjustment to reconcile net income/(loss) to net cash used in operating activities:    
Depreciation and amortization 166 183
Shared-based compensation 88 94
Changes in assets and liabilities related to operations:    
Trade accounts receivable (313) (1,725)
Inventories (264) 9
Prepaid expenses and other assets (109) 35
Accounts payable 563 335
Accrued expenses 102 432
Net cash used in operating activities (603) (568)
Investing activities:    
Proceeds from disposal of equipment   96
Acquisition of equipment and leasehold improvements (132) (77)
Net cash used in investing activities (132) 19
Financing activities:    
Principal payments on capital leases (79) (82)
Preoceeds from line of credit 700  
Payments on line of credit (500)  
Proceeds from exercise of stock options   2
Net cash provided by financing activities 121 (80)
Decrease in cash and cash equivalents (614) (629)
Cash and cash equivalents at beginning of period 1,955 1,779
Cash and cash equivalents at end of period 1,341 1,150
Supplemental cash flow information:    
Interest paid 20 16
Supplemental non-cash investing activities:    
Receivable from sale of property and equipment   40
Accounts payable incurred for the purchase of equipment and leasehold improvements 8 5
Proceeds from capital lease $ 45 $ 227