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Note 16 - 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
Sep. 25, 2019
USD ($)
Jan. 29, 2019
Oct. 08, 2015
Sep. 30, 2020
USD ($)
Dec. 10, 2019
USD ($)
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 $ 125