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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - UNAUDITED - USD ($) | Total | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | ---
BALANCE at Dec. 31, 2016 | $ 105,240,140 | $ 12,000 | $ 5,896,033 | $ 83,463,051 | $ 16,871,296 | $ (1,002,240)
BALANCE (in shares) at Dec. 31, 2016 |  | 12,000 | 5,896,033 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 1,643,851 |  |  |  | 1,643,851 |
Other comprehensive loss | 318,834 |  |  |  |  | 318,834
Issuance of common stock | 33,223,653 |  | $ 1,840,000 | 31,383,653 |  |
Issuance of common stock (in shares) |  |  | 1,840,000 |  |  |
Issuance of stock grants | 31,791 |  | $ 1,511 | 30,280 |  |
Issuance of stock grants (in shares) |  |  | 1,511 |  |  |
Exercise of stock options | 4,260,734 |  | $ 473,558 | 3,787,176 |  |
Cash dividends on preferred stock | (195,000) |  |  |  | (195,000) |
Redemption of preferred stock | (12,000,000) | $ (12,000) |  | (11,988,000) |  |
Redemption of preferred stock (in shares) |  | (12,000) |  |  |  |
Exercise of stock options (in shares) |  |  | 473,558 |  |  |
Stock option compensation expense | 26,812 |  |  | 26,812 |  |
BALANCE at Mar. 31, 2017 | 132,550,815 | $ 0 | $ 8,211,102 | 106,702,972 | 18,320,147 | (683,406)
BALANCE (in shares) at Mar. 31, 2017 |  | 0 | 8,211,102 |  |  |
BALANCE at Dec. 31, 2017 | 205,851,840 |  | $ 11,152,561 | 174,008,753 | 21,888,575 | (1,198,049)
BALANCE (in shares) at Dec. 31, 2017 |  |  | 11,152,561 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 3,414,771 |  |  |  | 3,414,771 |
Other comprehensive loss | (1,371,394) |  |  |  |  | (1,371,394)
Exercise of stock options | 950,521 |  | $ 81,245 | 869,276 |  |
Exercise of stock options (in shares) |  |  | 81,245 |  |  |
Restricted stock compensation expense | 69,706 |  |  | 69,706 |  |
Stock option compensation expense | 33,471 |  |  | 33,471 |  |
BALANCE at Mar. 31, 2018 | $ 208,948,915 |  | $ 11,233,806 | $ 174,981,206 | $ 25,303,346 | $ (2,569,443)
BALANCE (in shares) at Mar. 31, 2018 |  |  | 11,233,806 |  |  |

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