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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 ($)	Dec. 31, 2019 USD ($)
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							$ 137.5
Loss Contingency, Damages Awarded, Value	$ 375.0
Loss Contingency Accrual, Ending Balance								$ 125.0
Eagle View Technologies, Inc. and Pictometry International Group, Inc. v. Xactware Solutions, Inc. and Verisk Analytics, Inc. [Member] | Subsequent Event [Member]
Loss Contingency, Bond Secured					$ 305.0
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

X

- Definition

Amount of loss contingency liability.

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