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Note 6 - Income Taxes (Details Textual) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%
Deferred Tax Liabilities, Net $ 95.8