Fair Value Disclosures (Narrative) (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities transferred from level 1 to level 2	$ 0		$ 0
Securities transferred from level 2 to level 1	0		0
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount	0		0
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount	0		0
Fair Value, Equity, Level 1 to Level 2 Transfers, Amount	0		0
Fair Value, Equity, Level 2 to Level 1 Transfers, Amount	0		$ 0
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS securities	121,923,737	$ 122,149,272
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS securities	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total AFS securities