6. Fair Value (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U. S. Treasuries			$ 19,998
U. S. Government sponsored enterprises		$ 7,820	7,980
Mortgage-backed obligations of federal agencies		424	502
Equity securities	[1]		135
Total securities available for sale		8,244	28,615
Fair Value Inputs Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U. S. Treasuries			19,998
U. S. Government sponsored enterprises		0	0
Mortgage-backed obligations of federal agencies		0	0
Equity securities	[1]		0
Total securities available for sale		0	19,998
Fair Value Inputs Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U. S. Treasuries			0
U. S. Government sponsored enterprises		7,820	7,980
Mortgage-backed obligations of federal agencies		424	502
Equity securities	[1]		135
Total securities available for sale		8,244	8,617
Fair Value Inputs Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
U. S. Treasuries			0
U. S. Government sponsored enterprises		0	0
Mortgage-backed obligations of federal agencies		0	0
Equity securities	[1]		0
Total securities available for sale		$ 0	$ 0

[1] Transferred to other investments on January 1, 2018 upon adoption of ASU 2016-01.