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FAIR VALUE MEASUREMENTS (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2023 | Dec. 31, 2022
Investments in securities: |  |  |  |  |  |
Investments in trading securities | $ 22,894,000 |  | $ 22,894,000 |  |  | $ 15,342,000
Total assets measured at fair value | 23,153,000 |  | 23,153,000 |  |  | 18,369,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Beginning balance | 2,792,000 | $ 4,326,000 | 2,792,000 | $ 4,369,000 |  |
Unrealized gains (losses) on private investments | 0 | (302,000) | 0 | (345,000) |  |
Ending balance | 0 | $ 4,024,000 | 0 | $ 4,024,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | (2,792,000) |  | (2,792,000) |  |  |
Fair Value Inputs [Abstract] (Deprecated 2018-01-31) |  |  |  |  |  |
Long-term Investments | 7,247,000 |  | 7,247,000 |  |  | 4,455,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | 7,763,000 |  | 7,763,000 |  | $ 11,841,000 | 12,901,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings | $ (4,078,000) |  | $ (5,138,000) |  |  |
Unobservable input - revenue retention discount rate - maximum | true |  | true |  |  |
Unobservable input - revenue retention discount rate - weighted average | true |  | true |  |  |
Unobservable input - revenue retention discount rate - minimum | true |  | true |  |  |
Unobservable input - revenue retention volatility - weighted average | true |  | true |  |  |
Unobservable input - revenue retention volatility - maximum | true |  | true |  |  |
Unobservable input - revenue retention volatility - minimum | true |  | true |  |  |
Unobservable input - growth discount rate - weighted average | true |  | true |  |  |
Unobservable input - growth discount rate - maximum | true |  | true |  |  |
Unobservable input - growth discount rate - minimum | true |  | true |  |  |
Unobservable input - growth volatility - weighted average | true |  | true |  |  |
Unobservable input - growth volatility - maximum | true |  | true |  |  |
Unobservable input - growth volatility - minimum | true |  | true |  |  |
Asset Acquisition, Consideration Transferred, Contingent Consideration |  |  | $ 7,800,000 |  |  |
Level 1 |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |
Investments in trading securities | $ 22,894,000 |  | 22,894,000 |  |  | 15,342,000
Total assets measured at fair value | 22,894,000 |  | 22,894,000 |  |  | 15,342,000
Level 2 |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |
Investments in trading securities | 0 |  | 0 |  |  | 0
Total assets measured at fair value | 0 |  | 0 |  |  | 0
Level 3 |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |
Investments in trading securities | 0 |  | 0 |  |  | 0
Total assets measured at fair value | $ 0 |  | $ 0 |  |  | $ 2,792,000
Asset Acquisition, Consideration Transferred, Contingent Consideration | Level 3 |  | Level 3 |  |  | Level 3
Other Liabilities, Fair Value Disclosure | $ 7,763,000 |  | $ 7,763,000 |  |  | $ 12,901,000
Investments Measured at NAV |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |
Investments in trading securities | 0 |  | 0 |  |  | 0
Total assets measured at fair value | $ 259,000 |  | $ 259,000 |  |  | $ 235,000
Fair Value, Recurring |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |
Asset Acquisition, Consideration Transferred, Contingent Consideration | Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] |  | Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] |  |  | Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member]
Private investment fund |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |
Private | $ 259,000 |  | $ 259,000 |  |  | $ 235,000
Private investment fund | Level 1 |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |
Private | 0 |  | 0 |  |  | 0
Private investment fund | Level 2 |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |
Private | 0 |  | 0 |  |  | 0
Private investment fund | Level 3 |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |
Private | 0 |  | 0 |  |  | 0
Private investment fund | Investments Measured at NAV |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |
Private | $ 259,000 |  | $ 259,000 |  |  | 235,000
Private equity |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |
Private |  |  |  |  |  | 2,792,000
Private equity | Level 1 |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |
Private |  |  |  |  |  | 0
Private equity | Level 2 |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |
Private |  |  |  |  |  | 0
Private equity | Level 3 |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |
Private |  |  |  |  |  | 2,792,000
Private equity | Investments Measured at NAV |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |
Private |  |  |  |  |  | $ 0

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