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Amount of impairment for lessor's underlying asset for which right to use has been conveyed to lessee under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479773/842-30-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

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- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-4

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- Definition

Amount of sublease income excluding finance and operating lease expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
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Note 6 - Leases (Details Textual) $ in Millions		1 Months Ended		3 Months Ended	12 Months Ended
Note 6 - Leases (Details Textual) $ in Millions	Dec. 31, 2011 USD ($) ft²	Feb. 28, 2019 ft²	Jun. 30, 2012 USD ($) ft²	Sep. 30, 2023 USD ($) ft²	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Operating Lease, Expense					$ 4.9	$ 4.9	$ 5.1
Sublease Income					$ 0.5	$ 0.5	$ 0.5
CALIFORNIA
Percentage of Annual Rent Increment		3.00%
Area of Subleased Property (Square Foot) \| ft²		12,429		13,916
Impairment, Lessor Asset under Operating Lease				$ 0.6
Lease Agreement One [Member]
Area of Leased Property (Square Foot) \| ft²	65,656
Percentage of Annual Rent Increment	3.00%
Lease Agreement Two [Member]
Area of Leased Property (Square Foot) \| ft²			29,470
Percentage of Annual Rent Increment			3.00%
Letters of Credit Outstanding, Amount	$ 1.0		$ 1.1
Lease Option To Extend Term (Year)			5 years