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Note 6 - Income Taxes (Details Textual) - USD ($)
$ in Millions
6 Months Ended 9 Months Ended
Jun. 30, 2022
Sep. 30, 2021
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00%  
Deferred Tax Assets, Valuation Allowance $ 0.1  
Deferred Tax Liabilities, Net, Total $ 84.6  
Effective Income Tax Rate Reconciliation, Tax Credit, Amount, Total   $ 0.6