OPTIONS AND NONVESTED SHARES - Summary of stock options (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OPTIONS AND NONVESTED SHARES
Number of Options, Outstanding at beginning	107,304	229,249	314,491
Number of Options, Granted	0	0	0
Number of Options, Exercised	(49,900)	(121,945)	(85,242)
Number of Options, Forfeited and expired	0	0	0
Number of Options, Outstanding at ending	57,404	107,304	229,249	314,491
Number of Options, Vested	57,404
Number of Options, Exercisable	57,404
Weighted Average Exercise Price, Outstanding at beginning	$ 11.13	$ 10.37	$ 10.32
Weighted Average Exercise Price, Granted	0	0	0
Weighted Average Exercise Price, Exercised	12.26	9.71	10.18
Weighted Average Exercise Price, Forfeited and expired	0	0	0
Weighted Average Exercise Price, Outstanding	10.14	$ 11.13	$ 10.37	$ 10.32
Weighted Average Exercise Price, Vested	10.14
Weighted Average Exercise Price, Exercisable	$ 10.14
Weighted Average Remaining Contractual Term in Years, Outstanding	1 year 11 months 4 days	2 years 3 months 10 days	2 years 7 months 9 days	3 years 10 months 2 days
Weighted Average Remaining Contractual Term in Years, Vested	1 year 11 months 4 days
Weighted Average Remaining Contractual Term in Years, Exercisable	1 year 11 months 4 days
Aggregate Intrinsic Value, Outstanding at beginning	$ 7,570,681	$ 15,168,276	$ 30,568,083
Aggregate Intrinsic Value, Exercised	(3,910,884)	(9,137,231)	(7,868,258)
Aggregate Intrinsic Value, Outstanding	4,106,623	$ 7,570,681	$ 15,168,276	$ 30,568,083
Aggregate Intrinsic Value, Vested	4,106,623
Aggregate Intrinsic Value, Exercisable	$ 4,106,623

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of share options (or share units) exercised during the current period.

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