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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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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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