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STOCKHOLDERS' EQUITY - Compensation Plan (Details) $ / shares in Units, $ in Millions	1 Months Ended				3 Months Ended
	Nov. 30, 2018 $ / shares	Nov. 30, 2018 $ / shares	Jan. 31, 2015 $ / shares	Jan. 31, 2015 $ / shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) $ / shares shares
Retained earnings
Dividend per share					$ 0.6	$ 0.4
Employee Stock Purchase 2015 Plan
Information related to compensation cost
Purchase price for initial subscription (in dollars per share) | (per share)			$ 2.63	$ 38.44
Percentage of title acquired by employee in every two years on shares paid in previous two years					50.00%
Period of plan					8 years
Ratio of bonus shares granted to participant					0.1
Stock based compensation expense | $					$ 0.2	$ 0.2
Unrecognized compensation expense | $					$ 1.2	$ 1.8
Stock award activity, Shares
Outstanding shares at the beginning of the period | shares					1,264,410	1,379,734
Exercised (in shares) | shares					(293,041)	(54,221)
Outstanding shares at the end of the period | shares					971,369	1,325,513
Unit Weighted Average Grant Date Fair Value
Outstanding shares at the beginning of the period (in dollars per share)					$ 2.63	$ 2.63
Exercised (in dollars per share)					2.63	2.63
Outstanding shares at the end of the period (in dollars per share)					$ 2.63	$ 2.63
Employee Stock Purchase 2018 Plan
Information related to compensation cost
Purchase price for initial subscription (in dollars per share) | (per share)	$ 1.86	$ 37.89
Percentage of title acquired by employee in every two years on shares paid in previous two years					50.00%
Period of plan					8 years
Ratio of bonus shares granted to participant					0.1
Stock based compensation expense | $					$ 0.2	$ 0.2
Unrecognized compensation expense | $					$ 3.6	$ 4.3
Stock award activity, Shares
Outstanding shares at the beginning of the period | shares					3,918,458	4,002,898
Exercised (in shares) | shares					(592,768)
Outstanding shares at the end of the period | shares					3,325,690	4,002,898
Unit Weighted Average Grant Date Fair Value
Outstanding shares at the beginning of the period (in dollars per share)					$ 1.86	$ 1.86
Exercised (in dollars per share)					1.86
Outstanding shares at the end of the period (in dollars per share)					$ 1.86	$ 1.86

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