Note 3 - Investment Securities (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Summary of Investment Holdings, Schedule of Investments [Table Text Block]

			Gross		Gross
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
December 31, 2017:
Available for Sale
State and municipal securities	$	13,756,573	$	221,320	$	7,460	$	13,970,433
Residential mortgage-backed securities		12,075,689		121,840		122,287		12,075,242
	$	25,832,262	$	343,160	$	129,747	$	26,045,675
December 31, 2016:
Available for Sale
State and municipal securities	$	18,019,050	$	200,924	$	63,836	$	18,156,138
Residential mortgage-backed securities		26,427,933		242,541		265,932		26,404,542
	$	44,446,983	$	443,465	$	329,768	$	44,560,680

Investments Classified by Contractual Maturity Date [Table Text Block]

	Securities Available for Sale
	Amortized		Fair
	Cost		Value
Due in three months or less	$	55,000	$	55,004
Due after three months through one year		714,379		716,817
Due after one year through five years		4,430,045		4,477,805
Due after five years through ten years		4,212,871		4,312,268
Due after ten years		4,344,278		4,408,539
Residential mortgage-backed securities		12,075,689		12,075,242
	$	25,832,262	$	26,045,675

Schedule of Unrealized Loss on Investments [Table Text Block]

	Less than 12 Months				12 Months or More				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Losses		Value		Losses		Value		Losses
December 31, 2017
Securities Available for Sale
State and municipal securities	$	1,435,888	$	7,460	$	-	$	-	$	1,435,888	$	7,460
Residential mortgage-backed securities		2,035,206		12,564		6,209,019		109,723		8,244,225		122,287
	$	3,471,094	$	20,024	$	6,209,019	$	109,723	$	9,680,113	$	129,747
December 31, 2016
Securities Available for Sale
State and municipal securities	$	4,734,681	$	63,836	$	-	$	-	$	4,734,681	$	63,836
Residential mortgage-backed securities		13,364,755		187,191		4,422,865		78,741		17,787,620		265,932
	$	18,099,436	$	251,027	$	4,422,865	$	78,741	$	22,522,301	$	329,768