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FINANCING ARRANGEMENTS AND LONG-TERM DEBT (Details)	Mar. 10, 2020 USD ($) installment	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 09, 2020 USD ($)
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Outstanding borrowings		$ 75,600,000	$ 78,800,000
Fair value of outstanding borrowing		$ 74,700,000	$ 77,700,000
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Debt instrument, measurement input		0.019	0.025
2020 Credit Agreement
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Percentage of proceeds from asset sales used for mandatory repayments of the debt	100.00%
Percentage of net proceeds from issuances of debt and equity used for mandatory repayments of the debt	100.00%
Percentage of net proceeds from insurance recovery and condemnation events used for mandatory repayments of the debt	100.00%
2020 Credit Agreement | Federal Funds Rate
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Applicable margin (as a percent)	0.50%
2020 Credit Agreement | Eurodollar Rate
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Applicable margin (as a percent)	1.00%
2020 Credit Agreement | Term loan facility
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Maximum borrowing capacity	$ 86,000,000.0
Number of quarterly installments | installment	19
Periodic repayment	$ 1,075,000
2020 Credit Agreement | Revolving facility
FINANCING ARRANGEMENTS AND LONG-TERM DEBT
Maximum borrowing capacity	$ 54,000,000.0			$ 30,000,000.0
Borrowings under the revolver		$ 0	$ 0

X

- Definition

Represents the number of quarterly installments in which the debt instrument principal is to be repaid.

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Represents the percentage of net proceeds from issuances of debt and equity used for mandatory repayments of the debt.

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Represents the percentage of net proceeds from insurance recovery and condemnation events used for mandatory repayments of the debt.

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- Definition

Represents the percentage of proceeds from asset sales used for mandatory repayments of the debt.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt.

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Amount of the required periodic payments including both interest and principal payments.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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