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NOTES PAYABLE AND AMENDED CREDIT AGREEMENT- Amended Credit Agreement (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 05, 2013
Debt Instruments [Abstract] |  |  |  |  |
Percentage of unused commitment fee |  | 0.30% |  |  |
Aggregate principal payment due in 2022 |  | $ 672,000 | $ 672,000 |  |
Aggregate principal payment due in 2023 |  | 2,265,000 | 2,265,000 |  |
Notes Payable [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Aggregate amount of notes payable |  | 3,200,000 | 3,200,000 |  |
Aggregate principal payment due in 2021 |  | 500,000 | 500,000 |  |
Aggregate principal payment due in 2022 |  | 600,000 | 600,000 |  |
Aggregate principal payment due in 2023 |  | 2,100,000 | 2,100,000 |  |
Aggregate principal payment due in two months |  | $ 100,000 | $ 100,000 |  |
Minimum [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Spread on Libor variable rate |  | 1.25% | 1.25% |  |
Spread on variable rate |  |  | 0.10% |  |
Minimum [Member] | Notes Payable [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Average effective interest rate |  |  | 3.25% |  |
Maximum [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Spread on Libor variable rate |  | 2.00% | 2.00% |  |
Spread on variable rate |  |  | 1.00% |  |
Maximum [Member] | Notes Payable [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Average effective interest rate |  |  | 5.50% |  |
Credit Facility [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Revolving credit facility commitment |  | $ 150,000,000 | $ 150,000,000 |  | $ 125,000,000.0
Revolving credit facility maturity date |  |  | Nov. 30, 2025 |  |
Remaining revolving credit outstanding |  | $ 92,000,000.0 | $ 92,000,000.0 |  |
Average effective interest rate |  |  | 2.60% | 2.60% |
Credit Agreement [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Cash and noncash consideration with respect to acquisition after amendment | $ 50,000,000 |  |  |  |
Credit Agreement [Member] | Maximum [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Cash dividends after amendment | $ 50,000,000 |  |  |  |

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