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STOCKHOLDERS' EQUITY - Stock Based Compensation (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 grants
Stock Based Compensation
Number of shares outstanding	728,775	723,050	706,450	701,675
Number of shares awarded	153,575	151,500
Number of shares vested	130,750	129,925
Vesting period	5 years
Number of shares forfeited	500	200
Restricted stock units
Stock Based Compensation
Number of shares outstanding	230,752	223,802	230,752	223,802
Number of shares awarded			80,700	75,026	77,776
Performance cycle			3 years	3 years	3 years
Restricted stock units | Awards granted in 2021
Stock Based Compensation
Accrual for dividend equivalent rights	$ 81,000
Aggregate fair value of the shares granted	1,846,000
Restricted stock units | Awards granted in 2020
Stock Based Compensation
Aggregate fair value of the shares granted	962,000
Restricted stock units | Awards granted in 2019
Stock Based Compensation
Number of shares forfeited					2,750
Aggregate fair value of the shares granted	$ 1,446,000
Restricted stock units | Awards granted in 2018
Stock Based Compensation
Number of shares forfeited					2,500
TSR awards
Stock Based Compensation
Percentage of RSUs to vest upon achievement of specified criteria			50.00%	50.00%	50.00%
ROC Awards
Stock Based Compensation
Percentage of RSUs to vest upon achievement of specified criteria			50.00%	50.00%	50.00%
2019 Incentive Plan
Stock Based Compensation
Maximum number of shares authorized for issuance	750,000
Number of shares outstanding	678,027
2019 Incentive Plan | Restricted stock grants
Stock Based Compensation
Number of shares outstanding	447,275
2019 Incentive Plan | Restricted stock units
Stock Based Compensation
Number of shares outstanding	230,752
2016 Incentive Plan
Stock Based Compensation
Maximum number of shares authorized for issuance	0
2016 Incentive Plan | Restricted stock grants
Stock Based Compensation
Number of shares outstanding	281,500
2016 Incentive Plan | Restricted stock units
Stock Based Compensation
Number of shares awarded						76,250
Number of shares vested			73,750
Pay-for-performance program | Restricted stock units
Stock Based Compensation
Number of shares vested	0
Vesting period	3 years
Number of shares forfeited	0

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Represents the total fair value of other than stock (or unit) option plans granted during the reporting period.

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Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them.

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