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v3.20.1

Consolidated Statement of Changes in Stockholders' Equity - USD ($) | Total | Private Placement | Common Stock | Common Stock Private Placement | Additional Paid - In Capital | Additional Paid - In Capital Private Placement | Treasury Stock | Deferred Compensation | Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 |  |  | 16,874,235 |  |  |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 13,123,353 |  | $ 186,299 |  | $ 74,041,083 |  | $ (831,059) | $ (7,012,544) | $ (53,260,426)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock (shares) |  |  | 5,000 |  |  |  |  |  |
Issuance of common stock | 7,911 |  | $ 5 |  | 7,906 |  |  |  |
Issuance of common stock, employees, restricted (in shares) |  |  | 175,000 |  |  |  |  |  |
Issuance of common stock, employees, restricted | 0 |  | $ 175 |  | 303,575 |  |  | (303,750) |
Issuance of common stock under equity incentive plan (in shares) |  |  | 142,112 |  |  |  |  |  |
Issuance of common stock under equity incentive plan | 355,760 |  | $ 142 |  | 355,618 |  |  |  |
Reversal of deferred compensation amortization that did not vest (in shares) |  |  | (66,667) |  |  |  |  |  |
Reversal of deferred compensation amortization that did not vest | (5,525) |  | $ (1,060) |  | (148,540) |  |  | 144,075 |
Warrant compensation cost | 8,985 |  |  |  | 8,985 |  |  |  |
Deferred compensation amortization | 901,544 |  |  |  |  |  |  | 901,544 |
Purchase of treasury stock | (982,487) |  |  |  |  |  | (982,487) |  |
Net (loss) | (3,775,815) |  |  |  |  |  |  |  | (3,775,815)
Ending balance (in shares) at Dec. 31, 2018 |  |  | 17,129,680 |  |  |  |  |  |
Ending balance at Dec. 31, 2018 | 9,633,726 |  | $ 185,561 |  | 74,568,627 |  | (1,813,546) | (6,270,675) | (57,036,241)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock (shares) |  |  |  | 769,230 |  |  |  |  |
Issuance of common stock |  | $ 1,793,905 |  | $ 769 |  | $ 1,793,136 |  |  |
Issuance of common stock, employees, restricted (in shares) |  |  | 175,000 |  |  |  |  |  |
Issuance of common stock, employees, restricted | 0 |  | $ 175 |  | 272,825 |  |  | (273,000) |
Issuance of common stock under equity incentive plan (in shares) |  |  | 156,667 |  |  |  |  |  |
Issuance of common stock under equity incentive plan | 398,156 |  | $ 157 |  | 397,999 |  |  |  |
Reversal of deferred compensation amortization that did not vest (in shares) |  |  | (6,000) |  |  |  |  |  |
Reversal of deferred compensation amortization that did not vest | 0 |  | $ (6) |  | (13,254) |  |  | 13,260 |
Warrant compensation cost | 35,940 |  |  |  | 35,940 |  |  |  |
Deferred compensation amortization | 894,261 |  |  |  |  |  |  | 894,261 |
Purchase of treasury stock | (71,906) |  |  |  |  |  | (71,906) |  |
Net (loss) | (5,115,747) |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2019 |  |  | 18,224,577 |  |  |  |  |  |
Ending balance at Dec. 31, 2019 | $ 7,568,335 |  | $ 186,656 |  | $ 77,055,273 |  | $ (1,885,452) | $ (5,636,154) | $ (62,151,988)

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