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Note 6 - Income Taxes (Details Textual) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2022
Sep. 30, 2021
Dec. 31, 2021
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%   21.00%
Deferred Tax Assets, Valuation Allowance $ 0.1    
Deferred Tax Liabilities, Net, Total $ 84.7    
Effective Income Tax Rate Reconciliation, Tax Credit, Amount, Total   $ 0.6