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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited Consolidated Condensed) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Operating Activities:    
Net income (loss) $ 795 $ (2,022)
Adjustements to reconcile net loss to cash used in operating activities:    
Depreciation and amortization 265 234
Loss on disposal of equipment and leasehold improvements   16
Share-based compensation 147 179
Amortization of debt discount 200  
Changes in assets and liabilities related to operations:    
Trade accounts receivable (1,481) (544)
Inventories (1,030) 98
Prepaid expenses and other assets (332) (12)
Accounts payable (284) (632)
Accrued expenses 267 (19)
Deferred revenue (266) 594
Other long-term assets and liabilities (13) (53)
Net cash used in operating activities (1,732) (2,161)
Investing activities:    
Acquisition of equipment and leasehold improvements (448) (523)
Net cash used in investing activities (448) (523)
Financing activities:    
Principal payments on finance leases (172) (162)
Proceeds from line of credit, bank 1,500 1,000
Payments to the line of credit, bank (1,500) (500)
Proceeds from the line of credit, related party 10,390 8,166
Payments to the line of credit, related party (9,073) (7,895)
Proceeds from PPP / SBA Loan 952  
Proceeds from issuance of common stock   1,676
Proceeds from stock option exercises 23 16
Net cash provided by financing activities 2,120 2,301
Increase (decrease) in cash and cash equivalents (60) (383)
Cash and cash equivalents at beginning of period 1,194 1,345
Cash and cash equivalents at end of period 1,134 962
Supplemental cash flow information:    
Interest paid 152 126
Supplemental non-cash investing and finacing activities:    
Accounts payable incurred for the purchase of equipment and leasehold improvements $ 204 $ 18