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EARNINGS PER SHARE - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net earnings (basic)	$ 20,596	$ 14,439	$ 12,121
Net earnings (diluted)	$ 20,596	$ 14,439	$ 12,121
Denominator:
Weighted-average shares outstanding (basic) (in shares)	11,562,826	10,230,840	8,968,262
Effect of dilutive securities:
Common stock equivalent shares from stock options (in shares)	90,940	82,529	8,066
Weighted-average shares outstanding (diluted) (in shares)	11,653,766	10,313,369	8,976,328
Net earnings per share
Basic (in USD per share)	$ 1.78	$ 1.41	$ 1.35
Diluted (in USD per share)	$ 1.77	$ 1.40	$ 1.35

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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