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Note 11 - Dispositions (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Feb. 14, 2020
Feb. 01, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
May 25, 2021
Payments to Acquire Investments, Total     $ 23.6 $ 94.8 $ (0.0)  
Background Screening Business [Member]            
Proceeds from Divestiture of Businesses, Net of Cash Divested, Total $ 23.1          
Background Screening Business [Member] | Other Operating Income (Expense) [Member]            
Gain (Loss) on Disposition of Business       15.9    
Data Warehouse Business [Member] | Other Operating Income (Expense) [Member]            
Gain (Loss) on Disposition of Business       $ 3.5    
Vexcel Group, Inc. [Member]            
Payments to Acquire Investments, Total   $ 63.8        
Equity Securities Without Readily Determinable Fair Value, Percentage   35.00%       3.70%