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Income Taxes (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Amount of retained earnings which has no provision for federal income taxes $ 5,095,000    
Unrecorded deferred income tax liability 1,070,000    
Net operating loss carryforwards which expire from 2021 through 2039 20,207,000    
Unrecognized tax benefits 0 $ 0 $ 0
Increase in unrecognized tax benefits relative to tax positions taken 0 0 0
Accrual of unrecognized tax benefit, income tax penalties and interest accrued $ 0 $ 0 $ 0