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Income Taxes (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Taxes Narrative      
Operating loss carryforward limitations on use   <p><font style="font: 10pt Times New Roman, Times, Serif">Offset against future taxable income through 2034.</font></p>  
Estimated effective annual income tax rate   25.35% 34.00%
Change in net deferred income tax balances related to tax rate change $ 120,000