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Note 5 - Fair Value Measurements - Fair Value Measurements (Details) - USD ($)
$ in Thousands

Jun. 30, 2024

Dec. 31, 2023

Jun. 30, 2023

Total

$ 159,578

$ 134,500

US Treasury Bill Securities [Member]

Investments (2)

^[1]

91,319

110,577

US Treasury Notes Securities [Member]

Investments (2)

^[1]

34,772

Fair Value, Inputs, Level 1 [Member]

Total

33,487

$ 23,923

Fair Value, Inputs, Level 1 [Member] | US Treasury Bill Securities [Member]

Investments (2)

^[1]

0

0

Fair Value, Inputs, Level 1 [Member] | US Treasury Notes Securities [Member]

Investments (2)

^[1]

0

Fair Value, Inputs, Level 2 [Member]

Total

126,091

110,577

Fair Value, Inputs, Level 2 [Member] | US Treasury Bill Securities [Member]

Investments (2)

^[1]

91,319

110,577

Fair Value, Inputs, Level 2 [Member] | US Treasury Notes Securities [Member]

Investments (2)

^[1]

34,772

Fair Value, Inputs, Level 3 [Member]

Total

0

0

Fair Value, Inputs, Level 3 [Member] | US Treasury Bill Securities [Member]

Investments (2)

^[1]

0

0

Fair Value, Inputs, Level 3 [Member] | US Treasury Notes Securities [Member]

Investments (2)

^[1]

0

Money Market Funds [Member]

Corporate money market funds (1)

^[2]

33,487

$ 23,923

Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]

Corporate money market funds (1)

^[2]

33,487

23,923

Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]

Corporate money market funds (1)

^[2]

0

0

Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]

Corporate money market funds (1)

^[2]

$ 0

$ 0

[1]	We have current and non-current debt securities (U.S. Treasury bills and notes) intended to enhance returns on our cash as well as to fund future obligations.
[2]	Our corporate money market funds are readily convertible into cash and the net asset value of each fund on the last day of the quarter is used to determine its fair value.

X

- Definition

Fair value portion of asset recognized for present right to economic benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

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X

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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X

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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- Details

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