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NOTES PAYABLE AND AMENDED CREDIT AGREEMENT (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Dec. 05, 2013
Debt Instruments [Abstract]
Percentage of unused commitment fee		0.30%
Aggregate principal payment due in 2022		$ 5,079,000
Aggregate principal payment due in 2023		571,000
Notes Payable [Member]
Debt Instruments [Abstract]
Aggregate amount of notes payable		1,400,000
Aggregate principal payment due in 2021		500,000	$ 4,400,000
Aggregate principal payment due in 2022		600,000
Aggregate principal payment due in 2023		$ 300,000
Minimum [Member]
Debt Instruments [Abstract]
Spread on Libor variable rate		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%
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		$ 125,000,000.0
Revolving credit facility maturity date		Nov. 30, 2025
Remaining revolving credit outstanding		$ 109,000,000.0
Average effective interest rate		3.00%	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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Face (par) amount of debt instrument at time of issuance.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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