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STOCKHOLDERS' EQUITY - Stock Based Compensation (Details) - USD ($)	3 Months Ended			9 Months Ended			12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Jul. 31, 2018
Restricted stock grants
Stock Based Compensation
Number of shares awarded				151,500	149,550
Number of shares forfeited	500			900
Number of shares vested				145,725	122,125
Number of shares outstanding	706,550	701,675		706,550	701,675		674,250	707,050	701,675	701,675
Vesting period				5 years
Restricted stock units
Stock Based Compensation
Number of shares awarded	80,700	75,026		80,700	75,026
Number of shares forfeited					51,907		2,750
Number of shares vested				73,750	24,343
Number of shares outstanding	230,752	223,802		230,752	223,802		225,026	150,052	223,802	148,776
Restricted stock units | Awards granted in 2021
Stock Based Compensation
Number of shares issued under the Plan	80,700
Performance cycle	3 years
Accrual for dividend equivalent rights	$ 18,000			$ 18,000
Restricted stock units | Awards granted in 2020
Stock Based Compensation
Number of shares issued under the Plan		75,026
Restricted stock units | Awards granted in 2019
Stock Based Compensation
Number of shares issued under the Plan			77,776
TSR awards
Stock Based Compensation
Percentage of RSUs to vest upon achievement of specified criteria				50.00%
Valuation assumptions
Expected life				3 years
Dividend rate				5.91%
Risk-free interest rate minimum				0.03%
Risk-free interest rate maximum				0.35%
Expected price volatility minimum				26.74%
Expected price volatility maximum				41.53%
ROC Awards
Stock Based Compensation
Percentage of RSUs to vest upon achievement of specified criteria				50.00%
2019 Incentive Plan
Stock Based Compensation
Maximum number of shares authorized for issuance	750,000			750,000
2019 Incentive Plan | Restricted stock and RSU grants
Stock Based Compensation
Number of shares outstanding	524,952			524,952
2019 Incentive Plan | Restricted stock grants
Stock Based Compensation
Number of shares outstanding	294,200			294,200
2019 Incentive Plan | Restricted stock units
Stock Based Compensation
Number of shares outstanding	230,752			230,752
2016 Incentive Plan
Stock Based Compensation
Maximum number of shares authorized for issuance	0			0
2016 Incentive Plan | Restricted stock grants
Stock Based Compensation
Number of shares outstanding	412,350			412,350
2016 Incentive Plan | Restricted stock units
Stock Based Compensation
Number of shares forfeited					51,907	2,500
Number of shares vested				73,750	24,343
Number of shares outstanding											76,250
Pay-for-performance program | Restricted stock units
Stock Based Compensation
Number of shares forfeited	0			0
Number of shares vested	0			0
Vesting period				3 years
Pay-for-performance program | Restricted stock units | Awards granted in 2021
Valuation assumptions
Aggregate fair value of the shares granted	$ 1,647,000			$ 1,647,000
Pay-for-performance program | Restricted stock units | Awards granted in 2020
Valuation assumptions
Aggregate fair value of the shares granted	962,000			962,000
Pay-for-performance program | Restricted stock units | Awards granted in 2019
Valuation assumptions
Aggregate fair value of the shares granted	$ 1,446,000			$ 1,446,000

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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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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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