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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited Consolidated Condensed) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Operating activities:    
Net income $ 2,714 $ 795
Adjustments to reconcile net income to cash used in operating activities:    
Depreciation and amortization 328 265
Share-based compensation 124 147
Gain on PPP loan forgiveness (952)
Amortization of debt discount 903 200
Changes in assets and liabilities related to operations:    
Trade accounts receivable (1,791) (1,481)
Inventories (1,988) (1,030)
Prepaid expenses and other assets (91) (332)
Accounts payable 282 (284)
Accrued expenses 791 267
Deferred revenue (23) (266)
Other long-term assets and liabilities (28) (13)
Net cash provided by (used in) operating activities 269 (1,732)
Investing activities:    
Acquisition of equipment and leasehold improvements (1,445) (448)
Net cash used in investing activities (1,445) (448)
Financing activities:    
Principal payments on finance leases (139) (172)
Proceeds from line of credit, bank 500 1,500
Payments to the line of credit, bank (1,000) (1,500)
Proceeds from line of credit, related party 19,525 10,390
Payments to line of credit, related party (17,939) (9,073)
Proceeds from term loan, related party 500
Proceeds from PPP / SBA loan 952
Proceeds from stock option exercises 152 23
Net cash provided by financing activities 1,599 2,120
Increase in cash and cash equivalents 423 (60)
Cash and cash equivalents at beginning of period 957 1,194
Cash and cash equivalents at end of period 1,380 1,134
Supplemental cash flow information:    
Interest paid 178 152
Supplemental non-cash investing and financing activities:    
Accounts payable incurred for the purchase of equipment and leasehold improvements 28 204
Conversion of $2M convertible loan, related party 2,000
Interest paid via stock issuance, convertible loan, related party $ 19