4. Investment Securities (Details 1) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Held-to-Maturity Securities
Fair Value - Held-to-Maturity	$ 46,235,000	$ 43,182,000	$ 44,143,000
States and political subdivisions [Member]
Held-to-Maturity Securities
Amortized Cost - Held-to-Maturity	45,551,714	42,831,982	43,354,419
Gross Unrealized Gains - Held-to-Maturity	683,286	350,018	788,581
Gross Unrealized Losses - Held-to-Maturity	0	0	0
Fair Value - Held-to-Maturity	$ 46,235,000	$ 43,182,000	$ 44,143,000