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CREDIT FACILITY AND ACQUISITION DEBT (Narrative) (Details)		3 Months Ended			6 Months Ended		12 Months Ended
	Sep. 29, 2020 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021	May 13, 2021 USD ($)
Debt Covenant To Actual Ratios [Line Items]
Revolving credit facility present accordion provisions		$ 75,000,000.0			$ 75,000,000.0
Deferred payments	$ 2,100,000
Credit Facility amortization of debt issuance costs					345,000	$ 393,000
Debt Instrument, Debt Compliance, EBITDA					0.50
Debt Issuance Costs, Gross									$ 800,000
Term Loan [Member]
Debt Covenant To Actual Ratios [Line Items]
Revolving credit facility, maximum borrowing capacity			$ 190,000,000.0				$ 190,000,000.0
Credit Agreement [Member]
Debt Covenant To Actual Ratios [Line Items]
Acquisition debt imputed interest expense		372,000		$ 1,106,000	$ 817,000	2,336,000
Prime Rate Option [Member] | Line of Credit [Member]
Debt Covenant To Actual Ratios [Line Items]
Debt Instrument, Basis Spread on Variable Rate					0.75%
Libor Margin Option [Member] | Line of Credit [Member]
Debt Covenant To Actual Ratios [Line Items]
Debt Instrument, Basis Spread on Variable Rate					1.75%
Series of Individually Immaterial Business Acquisitions [Member]
Debt Covenant To Actual Ratios [Line Items]
Acquisition debt imputed interest expense		$ 93,000		$ 124,000	$ 190,000	$ 251,000
Revolving Credit Facility, Secured, Floating Rate [Member] | Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Covenant To Actual Ratios [Line Items]
Weighted average interest rate		2.50%		3.60%	2.80%	3.90%
Revolving Credit Facility, Secured, Floating Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Debt Covenant To Actual Ratios [Line Items]
Long-term Debt		$ 60,500,000			$ 60,500,000
Revolving Credit Facility, Secured, Floating Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] | Ratio Actual [Member]
Debt Covenant To Actual Ratios [Line Items]
Ratio of earnings to fixed cost obligations (in Ratio)		1.20			1.20
Revolving Credit Facility [Member] | Credit Agreement 2018 [Member]
Debt Covenant To Actual Ratios [Line Items]
Long-term Debt		$ 60,500,000	47,200,000		$ 60,500,000		$ 47,200,000		$ 58,800,000
Credit Facility amortization of debt issuance costs			$ 99,000	$ 118,000	$ 217,000	$ 245,000
Forecast | Ratio Actual [Member]
Debt Covenant To Actual Ratios [Line Items]
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)								5.00
Minimum [Member] | Ratio Actual [Member]
Debt Covenant To Actual Ratios [Line Items]
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)		0.25			0.25
Minimum [Member] | Deferred Purchase Price Notes [Member]
Debt Covenant To Actual Ratios [Line Items]
Debt Instrument, Imputed Interest Rate		7.30%			7.30%
Debt Instrument, Term							5 years
Maximum [Member] | Deferred Purchase Price Notes [Member]
Debt Covenant To Actual Ratios [Line Items]
Debt Instrument, Imputed Interest Rate		10.00%			10.00%
Debt Instrument, Term							20 years

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