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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Available-for-sale securities |  |
Available-for-sale securities |  | $ 7,665
Fair value transfers between levels |  |
Transfers from Level 1 to Level 2 | $ 0 |
Transfers from Level 2 to Level 1 | 0 |
Transfers into Level 3 | 0 |
Transfers out of Level 3 | 0 |
Fair value on a recurring basis |  |
Available-for-sale securities |  |
Available-for-sale securities | 0 | 7,665
Investments measured at Net Asset Value - Trading securities | 6,716 | 5,518
Fair value on a recurring basis | Municipal Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities | 0 | 1,490
Fair value on a recurring basis | Corporate Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities | 0 | 6,175
Fair value on a recurring basis | Quoted prices in active markets for identical assets (Level 1) |  |
Available-for-sale securities |  |
Available-for-sale securities | 0 | 0
Fair value on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Municipal Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities | 0 | 0
Fair value on a recurring basis | Quoted prices in active markets for identical assets (Level 1) | Corporate Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities | 0 | 0
Fair value on a recurring basis | Significant other observable inputs (Level 2) |  |
Available-for-sale securities |  |
Available-for-sale securities | 0 | 7,665
Fair value on a recurring basis | Significant other observable inputs (Level 2) | Municipal Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities | 0 | 1,490
Fair value on a recurring basis | Significant other observable inputs (Level 2) | Corporate Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities | 0 | 6,175
Fair value on a recurring basis | Significant unobservable inputs (Level 3) |  |
Available-for-sale securities |  |
Available-for-sale securities | 0 | 0
Fair value on a recurring basis | Significant unobservable inputs (Level 3) | Municipal Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities | 0 | 0
Fair value on a recurring basis | Significant unobservable inputs (Level 3) | Corporate Obligations |  |
Available-for-sale securities |  |
Available-for-sale securities | $ 0 | $ 0

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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