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FAIR VALUE (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair value |  |
Restricted investment securities - trading | $ 1,150 | $ 1,308
Total assets measured at fair value on a recurring basis | 1,150 | 1,308
Level 1 - Quoted Prices in Active Markets for Identical Assets |  |
Fair value |  |
Restricted investment securities - trading | 1,150 | 1,308
Total assets measured at fair value on a recurring basis | 1,150 | 1,308
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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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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