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FINANCING ARRANGEMENTS - Amortizing term loan (Details) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2020	Dec. 31, 2020	Dec. 31, 2021	Nov. 30, 2018
Debt Instrument
Long-term debt, net of issuance costs		$ 30,321,000	$ 52,067,000
Unamortized debt issuance costs		100,000	$ 225,000
Medium-term Notes | Amortizing Term Loan
Debt Instrument
Loaned amount				$ 14,000,000
Debt instrument, term	36 months
Long-term debt, net of issuance costs		$ 13,800,000
Medium-term Notes | Reference Rate | Amortizing Term Loan
Debt Instrument
Variable rate (percent)		2.25%
Effective interest rate (percent)		5.50%

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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