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CREDIT FACILITY AND ACQUISITION DEBT (Narrative) (Details)			3 Months Ended			9 Months Ended
	Sep. 01, 2021 USD ($)	Sep. 29, 2020 USD ($)	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2021	May 13, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Covenant To Actual Ratios [Line Items]
Revolving credit facility present accordion provisions			$ 75,000,000			$ 75,000,000
Deferred payments	$ 2,300,000	$ 2,100,000
Credit Facility amortization of debt issuance costs						459,000	$ 592,000
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
Credit Agreement [Member]
Debt Covenant To Actual Ratios [Line Items]
Acquisition debt imputed interest expense			383,000		$ 828,000	$ 1,200,000	3,164,000
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			$ 90,000		$ 122,000	$ 280,000	$ 373,000
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			2.00%		3.90%	2.50%	4.00%
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			$ 86,900,000			$ 86,900,000
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			$ 86,900,000			$ 86,900,000				$ 47,200,000
Credit Facility amortization of debt issuance costs				$ 80,000	$ 118,000	$ 297,000	$ 363,000
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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