Investment and Mortgage-Backed Securities, Available for Sale (Schedule of Temporarily Impaired Securities, Fair Value and Unrealized losses) (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Available For Sale, Percent of Unrealized Losses for Securities in a Continuous Loss Position, 12 Months or Longer	56.80%	39.60%
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 82,737,354	$ 113,060,506
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	87,827,536	65,523,232
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	170,564,890	178,583,738
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	957,106	1,485,802
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	1,258,733	975,131
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	2,215,839	2,460,933
Collateralized Loan Obligations [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	20,322,079	30,079,497
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	31,535,549	10,152,333
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	51,857,628	40,231,830
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	118,672	534,048
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	737,053	322,353
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	855,725	856,401
SBA Bonds
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	28,485,792	13,844,666
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	46,773,155	47,395,036
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	75,258,947	61,239,702
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	278,475	106,110
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	477,505	550,834
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	755,980	656,944
Taxable Municipal Bonds [Member]
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	7,093,640	13,810,279
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	7,093,640	13,810,279
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	77,571	364,686
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	77,571	364,686
Mortgage-Backed Securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	26,835,843	55,326,064
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	9,518,832	7,975,863
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	36,354,675	63,301,927
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Unrealized Losses	482,388	480,958
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Unrealized Losses	44,175	101,944
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses	$ 526,563	$ 582,902