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STOCKHOLDERS' EQUITY - Activity of Equity Incentive Plans (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted stock and RSU grants
Restricted stock and RSU grants:
Weighted average per share value of non-vested shares (based on grant price) (in dollars per share)	$ 26.47	$ 24.68
Value of stock vested during the year (based on grant price)	$ 3,236,000	$ 2,825,000
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share)	$ 33.75	$ 23.62
Total charge to operations:
Total charge to operations	$ 1,325,000	$ 1,343,000
Restricted stock grants
Summary of the activity of the incentive plans
Average per share grant price (in dollars per share)	$ 33.75	$ 20.34
Deferred compensation to be recognized over vesting period	$ 5,183,000	$ 3,082,000
Number of non-vested shares:
Non-vested beginning of period (in shares)	706,450	701,675	701,675
Number of shares awarded	153,575	151,500
Vested during period (in shares)	(130,750)	(129,925)
Forfeitures (in shares)	(500)	(200)
Non-vested end of period (in shares)	728,775	723,050	706,450	701,675
Total charge to operations:
Total charge to operations	$ 957,000	$ 897,000
Weighted average vesting period	2 years 9 months 18 days
Restricted stock grants | General and administrative expense
Total charge to operations:
Total compensation costs related to non-vested awards that have not yet been recognized	$ 11,346,000
Restricted stock units
Number of non-vested shares:
Non-vested beginning of period (in shares)	230,752	223,802	223,802
Number of shares awarded			80,700	75,026	77,776
Non-vested end of period (in shares)	230,752	223,802	230,752	223,802
Total charge to operations:
Total charge to operations	$ 368,000	$ 446,000
Weighted average vesting period	1 year 3 months 18 days
Restricted stock units | General and administrative expense
Total charge to operations:
Total compensation costs related to non-vested awards that have not yet been recognized	$ 1,963,000
Restricted stock units | Awards granted in 2018
Number of non-vested shares:
Forfeitures (in shares)					(2,500)
Restricted stock units | Awards granted in 2019
Number of non-vested shares:
Forfeitures (in shares)					(2,750)
2019 Incentive Plan
Number of non-vested shares:
Non-vested end of period (in shares)	678,027
2019 Incentive Plan | Restricted stock grants
Number of non-vested shares:
Non-vested end of period (in shares)	447,275
2019 Incentive Plan | Restricted stock units
Number of non-vested shares:
Non-vested end of period (in shares)	230,752
2016 Incentive Plan | Restricted stock grants
Number of non-vested shares:
Non-vested end of period (in shares)	281,500
2016 Incentive Plan | Restricted stock units
Number of non-vested shares:
Number of shares awarded						76,250
Vested during period (in shares)			(73,750)
Pay-for-performance program | Restricted stock units
Number of non-vested shares:
Vested during period (in shares)	0
Forfeitures (in shares)	0

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