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FAIR VALUE MEASUREMENTS - Summary of valuation of financial instruments measured at fair value on a recurring basis (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Available-for-sale securities
Available-for-sale securities	$ 37,299	$ 36,923
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1)
Assets:
Trading securities
Available-for-sale securities
Available-for-sale securities
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Municipal obligations
Available-for-sale securities
Available-for-sale securities
Fair Value, Measurements, Recurring | Quoted prices in active markets for identical assets (Level 1) | Corporate obligations
Available-for-sale securities
Available-for-sale securities
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2)
Assets:
Trading securities	6,172	6,026
Available-for-sale securities
Available-for-sale securities	37,299	36,923
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Municipal obligations
Available-for-sale securities
Available-for-sale securities	35,993	35,606
Fair Value, Measurements, Recurring | Significant other observable inputs (Level 2) | Corporate obligations
Available-for-sale securities
Available-for-sale securities	1,306	1,317
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3)
Assets:
Trading securities
Available-for-sale securities
Available-for-sale securities
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Municipal obligations
Available-for-sale securities
Available-for-sale securities
Fair Value, Measurements, Recurring | Significant unobservable inputs (Level 3) | Corporate obligations
Available-for-sale securities
Available-for-sale securities

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

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