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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Cash flows from operating activities: |  |
Net income (loss) | $ 2,332,773 | $ (6,544)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: |  |
Deferred benefit for income taxes | (63,578) | (663,772)
Loss on disposal of property and equipment | 80,846 | 11,586
(Recovery) provision for bad debt | (17,013) | 18,141
Warranty reserves | 173,262 | (28,031)
Amortization of deferred gain |  | (53,838)
Amortization of intangibles | 556,873 | 683,935
Depreciation | 923,735 | 922,597
Inventory reserves | 486,559 | 623,159
Amortization of debt discount | 146,294 | 376,004
Stock-based compensation expense | 1,695,105 | 724,378
Gain on forgiveness of Paycheck Protection Program (PPP) loan and interest | (1,514,354) |
Changes in operating assets and liabilities: |  |
Accounts receivable | 2,327,470 | 4,286,294
Inventories | (3,456,394) | (2,630,149)
Prepaid expenses and other current assets | 243,437 | (246,310)
Accounts payable | 1,083,954 | (3,148,762)
Accrued expenses and other liabilities | 623,627 | (1,118,861)
Net cash provided by (used in) operating activities | 5,622,596 | (250,173)
Cash flows from investing activities: |  |
Investment in short-term investment grade securities | (14,546,810) |
Purchases of property and equipment, including capitalization of labor costs for test equipment and ERP | (563,815) | (820,336)
Proceeds from sales of property and equipment |  | 1,542
Net cash used in investing activities | (15,110,625) | (818,794)
Cash flows from financing activities: |  |
Proceeds from exercise of stock options and warrants | 401,897 | 181,892
Payment of payroll taxes on net issuance of employee stock options | (811,379) | (684,875)
Proceeds from issuance of stock | 10,000,000 |
Stock issuance costs | (811,327) |
Net borrowings on bank lines of credit |  | (99,410)
Proceeds from notes payable | 2,307,818 |
Repayments on notes payable | (2,449,628) | (177,866)
Repayments on related-party notes payable | (206,669) | (584,502)
Proceeds, net of repayments, on secured convertible debt |  | 2,383,726
Repayments on senior secured convertible note |  | (409,090)
Proceeds on Paycheck Protection Program (PPP) note payable |  | 1,499,360
Net cash provided by financing activities | 8,430,712 | 2,109,235
Net change in cash and cash equivalents | (1,057,317) | 1,040,268
Effect of exchange rates on cash | (158,430) | 91,332
Cash and cash equivalents, beginning of year | 6,316,921 | 5,185,321
Cash and cash equivalents, end of year | 5,101,174 | 6,316,921
Supplemental disclosure of cash flow information: |  |
Cash paid during the year for interest | 120,434 | 301,214
Cash paid during the year for income taxes | 174,656 | 344,184
Supplemental disclosure of non-cash transactions: |  |
Original issue discount on senior secured convertible note |  | 300,000
Reclassification of inventories to property and equipment | $ 194,013 | $ 164,856

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585 + Details
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