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Note 9 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Deferred Compensation Liability, Current and Noncurrent, Total   $ 2.0  
Supplemental Unemployment Benefits, Severance Benefits   0.6  
Employee and Severance Agreement, Maximum Aggregate Exposure   0.9  
Employee Severance [Member]      
Restructuring Charges, Total   0.8  
Payments for Postemployment Benefits   $ 0.4  
Employee Severance [Member] | Forecast [Member]      
Payments for Postemployment Benefits $ 0.4    
Minimum [Member]      
Long-term Incentive Plan, Bonus Pool Percent   0.20% 1.00%
Maximum [Member]      
Long-term Incentive Plan, Bonus Pool Percent   1.30%  
Private Equity Funds [Member]      
Guarantor Obligations, Current Carrying Value   $ 3.8