Note 6 - Investment Securities Available for Sale (Tables)

12 Months Ended

Mar. 31, 2018

Notes Tables

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

			Gross		Gross
	Amortized		unrealized		unrealized		Fair
March 31, 2018	cost		gains		losses		value
U.S. government agencies	$	2,753,346	$	-	$	34,697	$	2,718,649
Municipal bonds		12,435,068		-		729,077		11,705,991
Corporate bonds		2,000,000		-		45,924		1,954,076
Mortgage-backed securities		61,078,665		12,993		2,066,238		59,025,420
	$	78,267,079	$	12,993	$	2,875,936	$	75,404,136

			Gross		Gross
	Amortized		unrealized		unrealized		Fair
March 31, 2017	cost		gains		losses		value
U.S. government agencies	$	3,525,373	$	323	$	13,393	$	3,512,303
Municipal bonds		17,096,477		21,858		950,496		16,167,839
Corporate bonds		2,000,000		-		83,478		1,916,522
Mortgage-backed securities		81,994,305		65,094		1,226,935		80,832,464
	$	104,616,155	$	87,275	$	2,274,302	$	102,429,128

Investments Classified by Contractual Maturity Date [Table Text Block]

	Available for Sale
	March 31, 2018				March 31, 2017
	Amortized		Fair		Amortized		Fair
	cost		value		cost		value
Maturing
Within one year	$	2,009,160	$	1,995,625	$	-	$	-
Over one to five years		1,231,928		1,196,368		4,234,642		4,240,740
Over five to ten years		3,578,827		3,500,641		5,538,313		5,404,810
Over ten years		10,368,499		9,686,082		12,848,895		11,951,114
Mortgage-backed, in monthly installments		61,078,665		59,025,420		81,994,305		80,832,464
	$	78,267,079	$	75,404,136	$	104,616,155	$	102,429,128

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]

	Less than 12 months				12 months or longer				Total
	Gross unrealized		Fair		Gross unrealized		Fair		Gross unrealized		Fair
March 31, 2018	losses		value		losses		value		losses		value
U.S. government agencies	$	21,163	$	723,023	$	13,534	$	1,995,625	$	34,697	$	2,718,648
Municipal bonds		-		-		729,077		11,705,991		729,077		11,705,991
Corporate bonds		-		-		45,924		1,954,076		45,924		1,954,076
Mortgage-backed securities		383,987		15,880,948		1,682,251		40,684,836		2,066,238		56,565,784
	$	405,150	$	16,603,971	$	2,470,786	$	56,340,528	$	2,875,936	$	72,944,499

	Less than 12 months				12 months or longer				Total
	Gross unrealized		Fair		Gross unrealized		Fair		Gross unrealized		Fair
March 31, 2017	losses		value		losses		value		losses		value
U.S. government agencies	$	13,393	$	3,256,964	$	-	$	-	$	13,393	$	3,256,964
Municipal bonds		950,496		13,982,251		-		-		950,496		13,982,251
Corporate bonds		-		-		83,478		1,916,522		83,478		1,916,522
Mortgage-backed securities		941,183		66,953,532		285,752		7,016,746		1,226,935		73,970,278
	$	1,905,072	$	84,192,747	$	369,230	$	8,933,268	$	2,274,302	$	93,126,015