EARNINGS PER SHARE - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net earnings (basic)	$ 10,432	$ 1,075	$ 21,394	$ 7,353
Net earnings (diluted)	$ 10,432	$ 1,075	$ 21,394	$ 7,353
Denominator:
Weighted-average shares outstanding (basic) (in shares)	12,056,550	12,128,516	12,047,643	12,352,074
Effect of dilutive securities:
Common stock equivalent shares from stock options (in shares)	195,037		168,311
Weighted-average shares outstanding (diluted) (in shares)	12,251,587	12,128,516	12,215,954	12,352,074
Net earnings per share
Basic (in USD per share)	$ 0.87	$ 0.09	$ 1.78	$ 0.59
Diluted (in USD per share)	$ 0.85	$ 0.09	$ 1.75	$ 0.59