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CREDIT FACILITY AND ACQUISITION DEBT (Narrative) (Details) |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 29, 2020 USD ($) | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2020 | Dec. 31, 2021 | Mar. 12, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 09, 2020 USD ($) | Mar. 19, 2014
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Lines of Credit |  | $ 34,068,000 |  | $ 33,000,000 |  |  |  |  |  |
Revolving credit facility present accordion provisions |  | 75,000,000.0 |  |  |  |  |  |  |  |
Deferred payments | $ 2,100,000 |  |  |  |  |  |  |  |  |
Credit Facility amortization of debt issuance costs |  | 193,000 |  | 200,000 |  |  |  |  |  |
Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  | 190,000,000.0 |  |  |  |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  | 15,000,000.0 |  |  |  |  |  |  |  |
Swingline [Member] |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  | 10,000,000.0 |  |  |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |
Credit Facility amortization of debt issuance costs |  | 74,000 |  | 67,000 |  |  |  |  |  |
Acquisition debt imputed interest expense |  | 6,625,000 |  | $ 6,625,000 |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 62 months |  |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition debt imputed interest expense |  | $ 445,000 |  | $ 1,230,000 |  |  |  |  |  |
Credit Agreement [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 3.125% |  |  |  |  |  |  |  |
Convertible Subordinated Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |
Carrying value of the liability component |  | $ 0 |  |  |  |  | $ 200,000 | $ 2,538,000 | $ 0 |
Credit Facility amortization of debt issuance costs |  | 1,000 |  | 6,000 |  |  |  |  |  |
Stated interest rate percentage |  |  |  |  |  |  |  |  |  | 2.75%
Acquisition debt imputed interest expense |  | $ 18,000 |  | 43,000 |  |  |  |  |  |
Prime Rate Option [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 1.50% |  |  |  |  |  |  |  |
Libor Margin Option [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.50% |  |  |  |  |  |  |  |
Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition debt imputed interest expense |  | $ 97,000 |  | $ 127,000 |  |  |  |  |  |
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 |  | 3.30% |  | 4.30% |  |  |  |  |  |
Revolving Credit Facility, Secured, Floating Rate [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |
Carrying value of the liability component |  | $ 28,300,000 |  |  |  |  |  |  |  |
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 indebtedness to net capital (in Ratio) (below at March 31, 2015) |  | 2.00 |  |  |  |  |  |  |  |
Ratio of earnings to fixed cost obligations (in Ratio) |  | 1.20 |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Credit Agreement 2018 [Member] |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |
Carrying value of the liability component |  |  |  |  |  |  |  | $ 47,200,000 |  |
Credit Facility amortization of debt issuance costs |  |  | $ 118,000 | $ 126,000 |  |  |  |  |  |
Forecast | Ratio Actual [Member] |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015) |  |  |  |  |  | 5.50 |  |  |  |
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 |  |  |  |
Minimum [Member] | Deferred Purchase Price Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Covenant To Actual Ratios [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Imputed Interest Rate |  | 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% |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  | 20 years |  |  |  |  |

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