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FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available-for-sale debt securities:
Assets	$ 18,352	$ 13,031
Municipal Obligations
Available-for-sale debt securities:
Assets	9,614	13,031
Corporate obligations
Available-for-sale debt securities:
Assets	8,738	0
Fair Value, Measurements, Recurring
Available-for-sale debt securities:
Assets	18,352	13,031
Investments measured at Net Asset Value - Trading securities	6,084	6,031
Fair Value, Measurements, Recurring | Municipal Obligations
Available-for-sale debt securities:
Assets	9,614	13,031
Fair Value, Measurements, Recurring | Corporate obligations
Available-for-sale debt securities:
Assets	8,738	0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
Available-for-sale debt securities:
Assets	0	0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Municipal Obligations
Available-for-sale debt securities:
Assets	0	0
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Corporate obligations
Available-for-sale debt securities:
Assets	0	0
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Available-for-sale debt securities:
Assets	18,352	13,031
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Municipal Obligations
Available-for-sale debt securities:
Assets	9,614	13,031
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Corporate obligations
Available-for-sale debt securities:
Assets	8,738	0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
Available-for-sale debt securities:
Assets	0	0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Municipal Obligations
Available-for-sale debt securities:
Assets	0	0
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Corporate obligations
Available-for-sale debt securities:
Assets	$ 0	$ 0

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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 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 2
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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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