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Shareholders' Equity | 6 Months Ended
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Jun. 30, 2020
Equity [Abstract] |
Stockholders' Equity | Shareholders’ Equity Issuances of Common Stock For the six months ended June 30, 2020, there were 123,000 shares of the Company’s common stock issued as a result of the exercise of stock options with a weighted average issue price of $1.88 per share. For the six months ended June 30, 2019, there were 397,671 shares of the Company’s common stock issued as a result of the exercise of stock options with a weighted average issue price of $1.59 per share. Changes in Stockholders Equity
|  | Six Months Ended June 30, 2020 (Unaudited) |  |  |  |  |  |  |  |
|  | Common Stock |  | Treasury Stock |  | Additional Paid-In Capital |  | Accumulated Deficit |  | Total
January 1, 2020 |  | $ | 39,613 |  |  | $ | (18,929,915) |  |  | $ | 96,105,851 |  |  | $ | (41,351,078) |  |  | $ | 35,864,471 |
Stock-based compensation |  | — |  |  | — |  |  | 426,939 |  |  | — |  |  | 426,939 |
Exercise of stock options |  | 100 |  |  | — |  |  | 174,900 |  |  | — |  |  | 175,000 |
Net loss |  | — |  |  | — |  |  | — |  |  | (2,214,139) |  |  | (2,214,139) |
March 31, 2020 |  | $ | 39,713 |  |  | $ | (18,929,915) |  |  | $ | 96,707,690 |  |  | $ | (43,565,217) |  |  | $ | 34,252,271 |
Stock issued |  | — |  |  | — |  |  | 436,613 |  |  | — |  |  | 436,613 |
Stock-based compensation |  | 23 |  |  | — |  |  | 55,720 |  |  | — |  |  | 55,743 |
Net loss |  | — |  |  | — |  |  | — |  |  | (2,651,422) |  |  | (2,651,422) |
June 30, 2020 |  | $ | 39,736 |  |  | $ | (18,929,915) |  |  | $ | 97,200,023 |  |  | $ | (46,216,639) |  |  | $ | 32,093,205 |
|  | Six Months Ended June 30, 2019 (Unaudited) |  |  |  |  |  |  |  |
|  | Common Stock |  | Treasury Stock |  | Additional Paid-In Capital |  | Accumulated Deficit |  | Total
January 1, 2019 |  | $ | 38,967 |  |  | $ | (18,929,915) |  |  | $ | 94,385,230 |  |  | $ | (33,043,113) |  |  | $ | 42,451,169 |
Stock-based compensation |  | — |  |  | — |  |  | 309,563 |  |  | — |  |  | 309,563 |
Net loss |  | — |  |  | — |  |  | — |  |  | (2,175,258) |  |  | (2,175,258) |
March 31, 2019 |  | $ | 38,967 |  |  | $ | (18,929,915) |  |  | $ | 94,694,793 |  |  | $ | (35,218,371) |  |  | $ | 40,585,474 |
Stock issued |  | 398 |  |  | — |  |  | 148,782 |  |  | — |  |  | 149,180 |
Stock-based compensation |  | — |  |  | — |  |  | 580,603 |  |  | — |  |  | 580,603 |
Net loss |  | — |  |  | — |  |  | — |  |  | (2,695,792) |  |  | (2,695,792) |
June 30, 2019 |  | $ | 39,365 |  |  | $ | (18,929,915) |  |  | $ | 95,424,178 |  |  | $ | (37,914,163) |  |  | $ | 38,619,465 |
Treasury Stock As of June 30, 2020 and December 31, 2019, there were 12,253,502 shares of common stock held in treasury, at a cost of approximately $18.9 million, representing the purchase price on the date the shares were surrendered to the Company.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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