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STOCKHOLDERS' EQUITY - Stock Based Compensation (Details) - USD ($)		6 Months Ended	12 Months Ended
	Jan. 06, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted stock
Stock Based Compensation
Number of shares awarded			149,550	150,050	144,750
Number of shares forfeited				12,400	400
Number of shares vested			122,125	114,650	106,000
Number of shares outstanding			701,675	674,250	651,250	612,900
Vesting period			5 years
RSUs
Stock Based Compensation
Number of shares awarded			75,026	77,776	76,250
Number of shares forfeited			51,907	5,250
Number of shares vested			24,343
Number of shares outstanding			223,802	225,026	152,500	76,250
TSR awards
Stock Based Compensation
Percentage of RSUs to vest upon achievement of specified criteria			50.00%
TSR awards | Awards granted in 2020
Valuation assumptions
Expected life			3 years
Dividend rate			10.40%
Risk-free interest rate minimum			0.10%
Risk-free interest rate maximum			0.18%
Expected price volatility minimum			51.24%
Expected price volatility maximum			77.92%
TSR awards | Awards granted in 2019
Valuation assumptions
Expected life				3 years
Dividend rate				6.22%
Risk-free interest rate minimum				1.79%
Risk-free interest rate maximum				2.07%
Expected price volatility minimum				21.37%
Expected price volatility maximum				23.04%
TSR awards | Awards granted in 2018
Valuation assumptions
Expected life					3 years
Dividend rate					6.82%
Risk-free interest rate minimum					2.18%
Risk-free interest rate maximum					2.70%
Expected price volatility minimum					22.29%
Expected price volatility maximum					25.99%
ROC Awards
Stock Based Compensation
Number of shares forfeited			0	5,250
Number of shares vested			0
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
2019 Incentive Plan | Restricted stock and RSU grants
Stock Based Compensation
Number of shares awarded			299,602
2019 Incentive Plan | Restricted stock
Stock Based Compensation
Number of shares awarded			149,550
Number of shares issued under the Plan	151,500
Aggregate value of restricted shares issued	$ 3,082,000
2019 Incentive Plan | RSUs
Stock Based Compensation
Number of shares awarded			150,052
2016 and 2012 Incentive Plans | Restricted stock and RSU grants
Stock Based Compensation
Number of shares outstanding			625,875
2016 and 2012 Incentive Plans | Restricted stock
Stock Based Compensation
Number of shares outstanding			552,125
2016 and 2012 Incentive Plans | RSUs
Stock Based Compensation
Number of shares outstanding			73,750
2016 and 2012 Incentive Plans | RSUs | Awards granted in 2017
Stock Based Compensation
Number of shares awarded						76,250
Number of shares forfeited		51,907
Number of shares vested		24,343
Pay-for-performance program | RSUs | Awards granted in 2020 | General and administrative expense
Valuation assumptions
Aggregate fair value of the shares granted			$ 850,000
Pay-for-performance program | RSUs | Awards granted in 2019 | General and administrative expense
Valuation assumptions
Aggregate fair value of the shares granted			1,085,000
Pay-for-performance program | RSUs | Awards granted in 2018 | General and administrative expense
Valuation assumptions
Aggregate fair value of the shares granted			$ 1,051,000
Prior Incentive Plans
Stock Based Compensation
Additional awards authorized			0

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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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Number of additional shares authorized for issuance under share-based payment arrangement.

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