Loans Receivable (Credit Quality Indicators by Loan Segment) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	$ 65,595,742	$ 68,969,029
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	63,473,175	65,960,593
Special mention/watch
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	1,283,122	1,719,095
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	839,445	1,289,341
One-to-four family residential
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	53,094,260	56,091,358
One-to-four family residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	51,758,334	54,042,992
One-to-four family residential | Special mention/watch
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	957,429	1,412,334
One-to-four family residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	378,497	636,032
Non-owner occupied one-to-four family residential
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	3,163,463	3,116,832
Non-owner occupied one-to-four family residential | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	2,849,866	2,782,817
Non-owner occupied one-to-four family residential | Special mention/watch
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	137,785	17,861
Non-owner occupied one-to-four family residential | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	175,812	316,154
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	2,834,855	3,615,351
Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	2,559,340	3,304,369
Commercial real estate | Special mention/watch
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	0	36,178
Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	275,515	274,804
Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	6,503,164	6,145,488
Consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	6,305,635	5,830,415
Consumer | Special mention/watch
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	187,908	252,722
Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable	$ 9,621	$ 62,351