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STOCK-BASED COMPENSATION (Details) - Stock Option Plans [Member]	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Options, Outstanding
Outstanding at beginning | shares	41,772
Exercised | shares	35,000
Outstanding and Exercisable at end | shares	6,772
Options, Outstanding, Weighted Average Exercise Price
Outstanding at beginning | $ / shares	$ 7.58
Exercised | $ / shares	6.60
Outstanding and Exercisable at end | $ / shares	$ 12.67
Options, Weighted Average Remaining Contractual Term
Outstanding and Exercisable at end	3 months

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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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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 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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