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STOCKHOLDERS' EQUITY, Summary of Stock Option Transactions (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock Options [Roll Forward] |  |  |  |  |  |  |
Granted (in shares) | 0 | 0 |  | 0 |  | 0 | 0
Stock Options, Weighted Average Exercise Price [Roll Forward] |  |  |  |  |  |  |
Proceeds from stock options exercised | $ 0 | $ 0 | [1] | $ 223,404 | [1] |  |
Stock Options [Member] |  |  |  |  |  |  |
Stock Options [Roll Forward] |  |  |  |  |  |  |
Outstanding, beginning of period (in shares) |  | 0 |  | 56,400 |  |  |
Granted (in shares) | 0 | 0 |  | 0 |  |  |
Forfeited or cancelled (in shares) |  |  |  | (12,000) |  |  |
Exercised (in shares) |  |  |  | (44,400) |  |  |
Outstanding, end of period (in shares) |  |  |  | 0 |  | 56,400 |
Exercisable at end of year (in shares) |  |  |  | 0 |  |  |
Stock Options, Weighted Average Exercise Price [Roll Forward] |  |  |  |  |  |  |
Outstanding, beginning of period (in dollars per share) |  | $ 0 |  | $ 5.14 |  |  |
Granted (in dollars per share) |  |  |  | 0 |  |  |
Forfeited or cancelled (in dollars per share) |  |  |  | 5.14 |  |  |
Exercised (in dollars per share) |  |  |  | 5.14 |  |  |
Outstanding, end of period (in dollars per share) |  |  |  | 0 |  | $ 5.14 |
Exercisable at end of year (in dollars per share) |  |  |  | 0 |  |  |
Weighted-average fair value of options granted during year (in dollars per share) |  |  |  | $ 0 |  |  |
Compensation cost | $ 0 | $ 0 |  | $ 0 |  | $ 0 | $ 0
Intrinsic value of stock options exercised |  |  |  | 200,000 |  |  |
Proceeds from stock options exercised |  |  |  | $ 200,000 |  |  |
Stock Options [Member] | Maximum [Member] |  |  |  |  |  |  |
Stock Options [Abstract] |  |  |  |  |  |  |
Options expiration period | 10 years |  |  |  |  |  |
[1] | As described in Note 2 to these Consolidated Financial Statements, we have restated the Consolidated Financial Statements.

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