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Note 9 - Fair Value Measurements (Details Textual) $ in Millions	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Securities, Available-for-Sale, Amortized Cost	$ 17.1
Debt Security Interest Rate Stated Percentage	7.50%
Debt Security, Available-For-Sale, Fair Value Discount Amount	$ 2.1	$ 2.2
Prepaid Expenses and Other Current Assets [Member]
Debt Securities, Available-for-Sale, Current	0.7	0.7
Other Noncurrent Assets [Member]
Debt Securities, Available-for-Sale, Noncurrent	$ 12.4	$ 13.0
Measurement Input, Discount Rate [Member]
Debt Securities, Available-for-Sale, Measurement Input	0.131	0.124

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- Definition

Amount of fair value discount on available-for-sale debt securities.

+ References

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Amortized cost 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
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479130/326-30-45-1

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-2

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+ References

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-SubTopic 10
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-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
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-Section 50
-Paragraph 2
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