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Note 16 - Commitments and Contingencies (Details Textual) $ in Millions | Feb. 16, 2021 USD ($) | Sep. 25, 2019 USD ($) | Jan. 29, 2019 | Oct. 08, 2015 | Apr. 15, 2021 USD ($) | Dec. 10, 2020 USD ($) | Mar. 02, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Eagle View Technologies, Inc. and Pictometry International Group, Inc. v. Xactware Solutions, Inc. and Verisk Analytics, Inc. [Member] |  |  |  |  |  |  |  |
Loss Contingency, Patents Allegedly Infringed, Number |  |  | 5 | 7 |  |  |  |
Loss Contingency, Pending Claims, Number, Ending Balance |  | 6 |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  | $ 125.0 |  |  |  |  |  |
Loss Contingency, Bond Secured |  |  |  |  | $ 305.0 |  | $ 137.5 |
Loss Contingency, Damages Awarded, Value | $ 375.0 |  |  |  |  |  |  |
Loss Contingency Accrual, Ending Balance |  |  |  |  |  |  |  | $ 125.0
Erica Jackson in the Court of Common Pleas of Lackawanna County, Pennsylvania against Lead Intelligence, Inc. [Member] |  |  |  |  |  |  |  |
Loss Contingency, Damages Per Day, Liquidated Damages |  |  |  |  |  | $ 100.0 |  |
Loss Contingency, Damages Per Day, Punitive Damages |  |  |  |  |  | $ 1,000.0 |  |

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