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Investment and Mortgage-Backed Securities, Held to Maturity (Schedule of investment and mortgage-backed securities held to maturity) (Details) - USD ($)
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]      
Held to maturity, gross unrealized gains $ 387,029    
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment 22,513,877    
Held to maturity, gross unrealized losses 31,366    
Debt Securities, Held-to-maturity, Fair Value 22,869,540   $ 23,249,400
Available-for-sale Securities, Gross Realized Losses 283,000 $ 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 998,764    
Held to maturity, gross unrealized gains 1,565    
Held to maturity, gross unrealized losses 0    
Debt Securities, Held-to-maturity, Fair Value 1,000,329    
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]      
Schedule of Held-to-maturity Securities [Line Items]      
Debt Securities, Held-to-maturity 21,515,113    
Held to maturity, gross unrealized gains 385,464    
Held to maturity, gross unrealized losses 31,366    
Debt Securities, Held-to-maturity, Fair Value $ 21,869,211