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CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Operating activities:    
Net loss $ (972) $ (574)
Adjustment to reconcile net income loss to net cash used in operating activities:    
Depreciation and amortization 239 267
Stock compensation expense 146 140
Changes in assets and liabilities related to operations:    
Trade accounts receivable (802) (1,147)
Inventories (706) (104)
Prepaid expenses and other assets (84) 53
Accounts payable 872 333
Accrued expenses 386 166
Net cash used in operating activities (921) (866)
Investing activities:    
Proceeds from disposal of equipment   136
Acquisition of equipment and leasehold improvements (115) (121)
Net cash (used in) provided by investing activities (115) 15
Financing activities:    
Principal payments on capital leases (114) (122)
Proceeds from line of credit 1,200 250
Payments on line of credit (1,000)
Proceeds from exercise of stock options and sale of common stock 29 14
Net cash provided by financing activities 115 142
Decrease in cash and cash equivalents (921) (709)
Cash and cash equivalents at beginning of period 1,955 1,779
Cash and cash equivalents at end of period 1,034 1,070
Supplemental cash flow information:    
Interest paid 32 24
Supplemental non-cash investing activities:    
Accounts payable incurred for the purchase of equipment and leasehold improvements 6 9
Proceeds from capital leases $ 248 $ 307