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Note 21 - Commitments and Contingencies (Details Textual) - Eagle View Technologies, Inc. and Pictometry International Group, Inc. v. Xactware Solutions, Inc. and Verisk Analytics, Inc. [Member] $ in Millions | Feb. 16, 2021 USD ($) | Sep. 25, 2019 USD ($) | Jan. 29, 2019 | Oct. 08, 2015 | Dec. 31, 2019 USD ($)
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Loss Contingency, Patents Allegedly Infringed, Number |  |  | 5 | 7 |
Loss Contingency, Pending Claims, Number, Ending Balance |  | 6 |  |  |
Loss Contingency, Damages Sought, Value |  | $ 125 |  |  |
Loss Contingency Accrual, Ending Balance |  |  |  |  | $ 125
Subsequent Event [Member] |  |  |  |  |
Loss Contingency, Damages Awarded, Value | $ 375 |  |  |  |

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- Definition Amount of damages awarded to the plaintiff in the legal matter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 + Details
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