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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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