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FAIR VALUE (Details) - Recurring basis - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Total |  |
Fair value |  |
Restricted investment securities - trading | $ 964 | $ 989
Total assets measured at fair value on a recurring basis | 964 | 989
Level 1 - Quoted Prices in Active Markets for Identical Assets |  |
Fair value |  |
Restricted investment securities - trading | 964 | 989
Total assets measured at fair value on a recurring basis | 964 | 989
Level 2 - Significant Other Observable Inputs |  |
Fair value |  |
Restricted investment securities - trading | 0 | 0
Total assets measured at fair value on a recurring basis | 0 | 0
Level 3 - Significant Unobservable Inputs |  |
Fair value |  |
Restricted investment securities - trading | 0 | 0
Total assets measured at fair value on a recurring basis | $ 0 | $ 0

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