Note 3 - Investment Securities (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Marketable Securities [Table Text Block]

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Securities Available for Sale
U.S. Government Agencies
Mortgage-Backed	$	354,931,318	$	258,049	$	(8,465,948	)	$	346,723,419
State, County and Municipal		4,493,085		22,835		(23,094	)		4,492,826
Corporate		2,047,517		12,483		-			2,060,000
Asset-Backed		992,641		-		(21,982	)		970,659
	$	362,464,561	$	293,367	$	(8,511,024	)	$	354,246,904

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Securities Available for Sale
U.S. Government Agencies
Mortgage-Backed	$	326,694,417	$	75,743	$	(7,672,786	)	$	319,097,374
State, County and Municipal		4,572,756		18,350		(30,610	)		4,560,496
	$	331,267,173	$	94,093	$	(7,703,396	)	$	323,657,870

Investments Classified by Contractual Maturity Date [Table Text Block]

	Securities Available for Sale
	Amortized Cost		Fair Value
Due in One Year or Less	$	301,299	$	301,605
Due After One Year Through Five Years		4,668,954		4,658,344
Due After Five Years Through Ten Years		877,788		894,743
Due After Ten Years		1,685,202		1,668,793
	$	7,533,243	$	7,523,485
Mortgage-Backed Securities		354,931,318		346,723,419
	$	362,464,561	$	354,246,904

Schedule of Unrealized Loss on Investments [Table Text Block]

	Less Than 12 Months					12 Months or Greater					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
December 31, 2017
U.S. Government Agencies
Mortgage-Backed	$	120,139,340	$	(1,655,223	)	$	190,196,101	$	(6,810,725	)	$	310,335,441	$	(8,465,948	)
State, County and Municipal		2,598,344		(23,094	)		-		-			2,598,344		(23,094	)
Asset – Backed		970,659		(21,982	)		-		-			970,659		(21,982	)
	$	123,708,343	$	(1,700,299	)	$	190,196,101	$	(6,810,725	)	$	313,904,444	$	(8,511,024	)
December 31, 201 6
U.S. Government Agencies
Mortgage-Backed	$	174,200,881	$	(3,459,564	)	$	107,481,698	$	(4,213,222	)	$	281,682,579	$	(7,672,786	)
State, County and Municipal		3,487,647		(30,610	)		-		-			3,487,647		(30,610	)
	$	177,688,528	$	(3,490,174	)	$	107,481,698	$	(4,213,222	)	$	285,170,226	$	(7,703,396	)