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Note 9 - Fair Value Measurements - Changes in Fair Value of Level 3 Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Contingent Payments [Member] |  |
Balance at beginning of reporting period, liability | $ (1,712) | $ (2,407)
Included in interest income (expense), liability | (26) | (39)
Included in other comprehensive income (loss), liability | 0 | 0
Included in other items, net, liability | (17) | (66)
Settlements, liability | 235 | 232
Balance at end of reporting period, liability | (1,520) | (2,280)
Investment, Available-For-Sale [Member] |  |
Balance at beginning of reporting period, asset | 16,151 | 15,772
Included in interest income (expense), asset | 40 | 37
Included in other comprehensive income (loss), asset | 1,554 | 643
Included in other items, net, asset | 0 | 0
Settlements, asset | 0 | 0
Balance at end of reporting period, asset | $ 17,745 | $ 16,452

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- Definition Amount of gain (loss) recognized in other items, net from asset measured at fair value on recurring basis using unobservable input (level 3). + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in other items, net from liability measured at fair value on recurring basis using unobservable input (level 3). + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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