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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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