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STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating activities: |  |  |
Net income | $ 9,630,959 | $ 6,303,450 | $ 499,764
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Change in allowance for doubtful accounts | 31,338 | 15,833 | (7,083)
Change in provision for excess and obsolete inventory | 48,114 | 111,790 | 69,199
Depreciation and amortization | 1,242,325 | 1,105,003 | 1,308,738
Write-off of non-trade accounts receivable |  |  | 205,444
Stock-based compensation | 1,854,965 | 1,764,319 | 2,454,363
Deferred income taxes, net | (596,755) | (144,430) | (150,657)
(Gain) loss on maturities of investments | (10,764) | 28,036 | 6,757
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (3,114,649) | (446,896) | (201,591)
Inventory | 123,680 | (121,591) | (334,113)
Prepaid expenses and other current assets | (487,650) | (407,461) | (1,161,964)
Other assets | (171,002) | 65,135 | (13,860)
Accounts payable | 149,319 | 34,161 | (523,449)
Accrued payroll and benefits | 363,888 | 289,985 | 477,070
Other accrued taxes | 463,576 | 23,498 | (9,592)
Warranty reserve | 7,237 | 13,986 | 19,633
Deferred revenue | 700,348 | (5,885) | 944,632
Other current liability |  | (150) | (12,063)
Prepaid income taxes, net of accrued income taxes | (3,055) | (1,252,768) | (155,310)
Other | 859 |  |
Net cash provided by operating activities | 10,232,733 | 7,376,015 | 3,415,918
Investing activities: |  |  |
Purchases of investments |  | (1,124,512) | (2,693,739)
Proceeds from maturity of investments | 3,687,000 | 2,905,000 | 2,495,004
Purchases of property and equipment | (368,281) | (228,315) | (775,574)
Capitalized intangible assets | (117,531) | (36,350) | (49,189)
Net cash provided by (used in) investing activities | 3,201,188 | 1,515,823 | (1,023,498)
Financing activities: |  |  |
Proceeds from stock option and warrant exercises | 2,493,315 | 1,239,435 | 76,366
Taxes paid for the net share settlement of restricted stock units | (473,143) | (309,561) | (158,140)
Purchases of treasury stock |  |  | (1,818,541)
Net cash provided by (used in) financing activities | 2,020,172 | 929,874 | (1,900,315)
Net increase in cash and cash equivalents | 15,454,093 | 9,821,712 | 492,105
Cash and cash equivalents, beginning of year | 28,027,688 | 18,205,976 | 17,713,871
Cash and cash equivalents, end of year | 43,481,781 | 28,027,688 | 18,205,976
Supplemental disclosure of cash flow information: |  |  |
Cash paid for income taxes | 12,000 | 1,375,714 | 1,205,028
Right-of-use asset recognized in exchange for new lease obligation | 3,182,724 |  |
Operating and short-term lease payments recorded within cash flow from operating activities | $ 428,176 | $ 418,772 | $ 409,378

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