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FAIR VALUE MEASUREMENTS (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Available-for-sale securities |  |
Available-for-sale securities | $ 0 | $ 0
Transfers from Level 1 to Level 2 | 0 | 0
Transfers from Level 2 to Level 1 | 0 | 0
Transfers into Level 3 | 0 | 0
Transfers out of Level 3 | 0 | 0
Fair value on a recurring basis |  |
Available-for-sale securities |  |
Investments measured at Net Asset Value - Trading securities | $ 15,400,000 | $ 9,900,000

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