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DEBT (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 04, 2015 | May 31, 2020 | Mar. 31, 2020 | Sep. 23, 2020 | Sep. 25, 2019 | Sep. 23, 2020 | Sep. 25, 2019 | Apr. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from revolving credit facility |  |  |  |  |  | $ 50,000,000 | $ 0 |
Interest costs incurred |  |  |  | $ 143,000 | $ 133,000 | 697,000 | $ 302,000 |
Notes payable |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from revolving credit facility |  |  | $ 50,000,000 |  |  |  |  |
Notes payable |  |  |  | 50,000,000 |  | 50,000,000 |  |
Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from bank debt |  |  |  |  |  |  |  | $ 10,000,000
Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 50,000,000 |  | 50,000,000 |  |
Line of Credit Facility, Incremental Borrowing Capacity |  |  |  | 100,000,000 |  | 100,000,000 |  |
Third Amendment and Restated Credit Arrangement | Line of credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Term to maturity | 5 years |  |  |  |  |  |  |
Third Amendment and Restated Credit Arrangement | Letter of credit | Line of credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 15,000,000 |  | $ 15,000,000 |  |
Third Amendment and Restated Credit Arrangement | Minimum | Line of credit | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.00% |  |
Third Amendment and Restated Credit Arrangement | Minimum | Line of credit | Prime rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.00% |  |
Third Amendment and Restated Credit Arrangement | Maximum | Line of credit | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.50% |  |
Third Amendment and Restated Credit Arrangement | Maximum | Line of credit | Prime rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 0.50% |  |
First Amendment to the Credit Agreement | Line of credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, minimum required liquidity |  | $ 25,000,000 |  |  |  |  |  |
First Amendment to the Credit Agreement | Minimum | Line of credit | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |  |  |  |
First Amendment to the Credit Agreement | Minimum | Line of credit | Prime rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.00% |  |  |  |  |  |
First Amendment to the Credit Agreement | Maximum | Line of credit | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.50% |  |  |  |  |  |
First Amendment to the Credit Agreement | Maximum | Line of credit | Prime rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.50% |  |  |  |  |  |

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