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Note I - Income Taxes (Details Textual) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Statute of Limitations (Year) 3 years  
Open Tax Year 2016 2017 2018 2019  
Income Tax Examination, Penalties and Interest Expense, Total $ 0 $ 0
Effective Income Tax Rate Reconciliation, Percent, Total 29.70% 23.20%