Note 4 - Investment Securities Available for Sale (Tables)

6 Months Ended

Sep. 30, 2018

Notes Tables

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

			Gross		Gross
	Amortized		unrealized		unrealized		Fair
September 30, 2018	cost		gains		losses		value
U.S. government agencies	$	2,746,829	$	-	$	35,162	$	2,711,667
Municipal bonds		12,376,464		-		884,033		11,492,431
Corporate bonds		2,000,000		-		50,868		1,949,132
Mortgage-backed securities		55,208,284		3,390		2,501,915		52,709,759
	$	72,331,577	$	3,390	$	3,471,978	$	68,862,989

			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

Investments Classified by Contractual Maturity Date [Table Text Block]

	Available for Sale
	September 30, 2018				March 31, 2018
	Amortized		Fair		Amortized		Fair
	cost		value		cost		value
Maturing
Within one year	$	2,002,643	$	1,998,068	$	2,009,160	$	1,995,625
Over one to five years		1,228,815		1,180,880		1,231,928		1,196,368
Over five to ten years		3,573,299		3,476,232		3,578,827		3,500,641
Over ten years		10,318,536		9,498,050		10,368,499		9,686,082
Mortgage-backed securities, in monthly installments		55,208,284		52,709,759		61,078,665		59,025,420
	$	72,331,577	$	68,862,989	$	78,267,079	$	75,404,136

Debt Securities, Available-for-sale, 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
September 30, 2018	losses		value		losses		value		losses		value
U.S. government agencies	$	-	$	-	$	35,162	$	2,711,667	$	35,162	$	2,711,667
Municipal bonds		-		-		884,033		11,492,431		884,033		11,492,431
Corporate bonds		-		-		50,868		1,949,132		50,868		1,949,132
Mortgage-backed securities		185,975		6,707,755		2,315,940		45,756,778		2,501,915		52,464,533
	$	185,975	$	6,707,755	$	3,286,003	$	61,910,008	$	3,471,978	$	68,617,763

	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