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STOCK OPTIONS - Share based compensation (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Weighted-Average Exercise Price |  |  |
Proceeds from Stock Options Exercised | $ 922,512 |  |
Stock Option Plan 2008 |  |  |
STOCK OPTIONS |  |  |
Shares available for future issuance | 0 |  |
Stock Option | Director, officer, and employee |  |  |
STOCK OPTIONS |  |  |
Shares expired | 8,300 | 661,003 | 505,216
Number of options |  |  |
Outstanding at beginning of period (in shares) | 639,300 | 1,300,303 | 1,805,519
Exercised (in shares) | (431,550) |  |
Forfeited (in shares) | (8,300) | (661,003) | (505,216)
Outstanding at end of period (in shares) | 199,450 | 639,300 | 1,300,303
Exercisable (in shares) | 199,450 | 639,300 | 1,300,303
Weighted-Average Exercise Price |  |  |
Outstanding at beginning of period (in dollars per share) | $ 2.12 | $ 1.57 | $ 1.51
Exercise price (in dollars per share) | (2.14) |  |
Forfeited (in dollars per share) | (2.75) | (1.05) | (1.36)
Outstanding at end of period (in dollars per share) | 2.05 | 2.12 | 1.57
Exercisable (in dollars per share) | $ 2.05 | $ 2.12 | $ 1.57
Stock Option | Employees |  |  |
STOCK OPTIONS |  |  |
Options issued (in shares) | 0 | 0 | 0
Stock Option | Non Employees |  |  |
STOCK OPTIONS |  |  |
Options issued (in shares) | 0 | 0 | 0
Shares expired |  | 57,500 |
Number of options |  |  |
Outstanding at beginning of period (in shares) |  | 57,500 | 57,500
Forfeited (in shares) |  | (57,500) |
Outstanding at end of period (in shares) |  |  | 57,500
Exercisable (in shares) |  |  | 57,500
Weighted-Average Exercise Price |  |  |
Outstanding at beginning of period (in dollars per share) |  | $ 0.81 | $ 0.81
Forfeited (in dollars per share) |  | $ (0.81) |
Outstanding at end of period (in dollars per share) |  |  | 0.81
Exercisable (in dollars per share) |  |  | $ 0.81
Stock Option | Stock Option Plan 2008 |  |  |
Number of options |  |  |
Granted (in shares) | 3,649,508 |  |
Outstanding at end of period (in shares) | 199,450 |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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