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Note 4 - Investments - Securities in a Continuous Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 2023 USD ($)
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Fair value unrealized loss, less than 12 months | $ 2,017
Gross unrealized loss, less than 12 months | 43
Fair value unrealized loss, greater than 12 months | 26,282
Gross unrealized loss, greater than 12 months | 1,108
US Treasury Securities [Member] |
Fair value unrealized loss, less than 12 months | 0
Gross unrealized loss, less than 12 months | 0
Fair value unrealized loss, greater than 12 months | 15,433
Gross unrealized loss, greater than 12 months | 798
Certificates of Deposit [Member] |
Fair value unrealized loss, less than 12 months | 2,017
Gross unrealized loss, less than 12 months | 43
Fair value unrealized loss, greater than 12 months | 10,849
Gross unrealized loss, greater than 12 months | $ 310

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + Details
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