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Investment and Mortgage-Backed Securities, Held to Maturity (Schedule of investment and mortgage-backed securities held to maturity) (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]      
Held to maturity, gross unrealized gains $ 186,240    
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 23,437,877    
Held to maturity, gross unrealized losses 105,024    
Debt Securities, Held-to-maturity, Fair Value 23,519,093   $ 23,249,400
Available-for-sale Securities, Gross Realized Losses 8,000 $ 67,000  
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]      
Schedule of Held-to-maturity Securities [Line Items]      
Debt Securities, Held-to-maturity 998,656    
Held to maturity, gross unrealized gains 0    
Held to maturity, gross unrealized losses 7,071    
Debt Securities, Held-to-maturity, Fair Value 991,585    
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Schedule of Held-to-maturity Securities [Line Items]      
Debt Securities, Held-to-maturity 22,439,221    
Held to maturity, gross unrealized gains 186,240    
Held to maturity, gross unrealized losses 97,953    
Debt Securities, Held-to-maturity, Fair Value $ 22,527,508