FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	$ 165,277	$ 172,635
Municipal Debt Securities
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	27,474	47,655
Corporate Debt Securities
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	88,659	92,778
U.S. Government Agency Securities
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	49,144	32,202
Recurring
FAIR VALUE MEASUREMENTS
Cash & Cash Equivalents	71,587	92,086
Available-for-Sale Securities:	165,277	172,635
Total Assets Measured at Fair Value on a Recurring Basis	236,864	264,721
Recurring \| Municipal Debt Securities
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	27,474	47,655
Recurring \| Corporate Debt Securities
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	88,659	92,778
Recurring \| U.S. Government Agency Securities
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	49,144	32,202
Recurring \| Level 1
FAIR VALUE MEASUREMENTS
Cash & Cash Equivalents	71,587	73,727
Available-for-Sale Securities:	0	0
Total Assets Measured at Fair Value on a Recurring Basis	71,587	73,727
Recurring \| Level 1 \| Municipal Debt Securities
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	0	0
Recurring \| Level 1 \| Corporate Debt Securities
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	0	0
Recurring \| Level 1 \| U.S. Government Agency Securities
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	0	0
Recurring \| Level 2
FAIR VALUE MEASUREMENTS
Cash & Cash Equivalents	0	18,359
Available-for-Sale Securities:	165,277	172,635
Total Assets Measured at Fair Value on a Recurring Basis	165,277	190,994
Recurring \| Level 2 \| Municipal Debt Securities
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	27,474	47,655
Recurring \| Level 2 \| Corporate Debt Securities
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	88,659	92,778
Recurring \| Level 2 \| U.S. Government Agency Securities
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	49,144	32,202
Recurring \| Level 3
FAIR VALUE MEASUREMENTS
Cash & Cash Equivalents	0	0
Available-for-Sale Securities:	0	0
Total Assets Measured at Fair Value on a Recurring Basis	0	0
Recurring \| Level 3 \| Municipal Debt Securities
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	0	0
Recurring \| Level 3 \| Corporate Debt Securities
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	0	0
Recurring \| Level 3 \| U.S. Government Agency Securities
FAIR VALUE MEASUREMENTS
Available-for-Sale Securities:	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562

Reference 4: 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 https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

+ Details

Name:	us-gaap_CashAndCashEquivalentsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: