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Note I - Income Taxes (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Statute of Limitations 3 years  
Open Tax Year 2015 2016 2017 2018  
Income Tax Examination, Penalties and Interest Expense, Total $ 0 $ 0
Effective Income Tax Rate Reconciliation, Percent, Total 22.90% 23.40%