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v3.20.1

Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Operating activities |  |
Net income (loss) | $ 286,586 | $ (571,141)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |
Stock-based compensation | 519,891 | 487,806
Depreciation and amortization | 462,930 | 432,042
Changes in deferred taxes | 274,004 | (143,459)
Changes in operating assets and liabilities: |  |
Accounts receivable | (469,829) | 320,148
Inventories | (906,580) | (74,062)
Prepaid expenses and other current assets | (4,295) | 77,677
Other long-term assets | (1,320) | 435
Accounts payable and accrued expenses | 551,392 | 421,222
Accrued payroll and related expenses | 54,043 | (118,692)
Net deferred revenue on shipments to distributors | 145,256 | (56,256)
Deferred service revenue | 8,676 | 3,952
Change in deferred rent | (47,220) | (29,527)
Net cash provided by operating activities | 873,534 | 750,145
Investing activities |  |
Purchase of equipment | (595,154) | (423,700)
Capitalized software costs | (7,800) |
Net cash used in investing activities | (602,954) | (423,700)
Financing activities |  |
Payments on operating leases | (15,696) | (28,420)
Proceeds from borrowings under bank line of credit agreement | 17,423,000 | 13,546,964
Repayments of borrowings under bank line of credit agreement | (17,327,329) | (12,230,186)
Proceeds from bank term loan |  | 4,000,000
Repayments of bank term loan | (500,000) | (3,166,667)
Common stock repurchases and related expenses |  | (5,021,830)
Stock options exercised | 23,314 | 279,177
Net cash used in financing activities | (396,711) | (2,620,962)
Net increase (decrease) in cash and cash equivalents | (126,131) | (2,294,517)
Cash and cash equivalents at beginning of year | 1,084,991 | 3,379,508
Cash and cash equivalents at end of year | 958,860 | 1,084,991
Supplemental cash flow information |  |
Cash paid for interest | $ 100,048 | $ 105,082

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