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v3.21.1

Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Operating activities |  |
Net income (loss) | $ (3,278,601) | $ 286,586
Adjustments to reconcile net loss to net cash provided by operating activities: |  |
Stock-based compensation | 507,051 | 519,891
Depreciation and amortization | 596,900 | 462,930
Deferred tax expenses (benefits) |  | 274,004
Forgiveness of PPP loan | 1,058,700 |
Amortization of debt discount | 11,030 |
Goodwill impairment charges | 4,427,000 |
Changes in operating assets and liabilities: |  |
Accounts receivable | 724,492 | (469,829)
Inventories | (16,934) | (906,580)
Prepaid expenses and other current assets | (23,259) | (4,295)
Other long-term assets |  | (1,320)
Accounts payable and accrued expenses | (712,147) | 551,392
Accrued payroll and related expenses | (190,839) | 54,043
Net deferred revenue on shipments to distributors | (96,631) | 145,256
Deferred service revenue | (19,295) | 8,676
Net cash provided by operating activities | 804,445 | 873,534
Investing activities |  |
Purchase of equipment | (536,481) | (595,154)
Capitalized software costs |  | (7,800)
Net cash used in investing activities | (536,481) | (602,954)
Financing activities |  |
Payments on operating leases | (8,291) | (15,696)
Common stock repurchase and related expenses | (8,480) |
Proceeds from borrowings under bank line of credit agreement | 5,630,000 | 17,423,000
Repayments of borrowings under bank line of credit agreement | (7,042,449) | (17,327,329)
Repayments of bank term loan | (333,333) | (500,000)
Proceeds from notes payable | 1,208,700 |
Repayments of notes payable | (150,000) |
Proceeds from subordinated convertible notes payable, net of discount | 168,321 |
Proceeds from subordinated convertible notes payable, net of discount-related party | 1,262,406 |
Proceeds from stock options exercised | 168,065 | 23,314
Net cash provided by (used in) financing activities | 894,939 | (396,711)
Net increase (decrease) in cash and cash equivalents | 1,162,903 | (126,131)
Cash and cash equivalents at beginning of year | 958,860 | 1,084,991
Cash and cash equivalents at end of year | 2,121,763 | 958,860
Supplemental cash flow information |  |
Cash paid for interest | 94,417 | 100,048
Cash paid for income taxes | $ 4,918 | $ 800

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