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Multiemployer Defined Benefit Plan - Federal's contributions to the plan (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Multiemployer Plan Number 333  
Entity Tax Identification Number 13-5645888  
Cincinnati Federal [Member]    
Multiemployer Plan, Contributions by Employer $ 105,511 $ 145,930