CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Unearned Shares Issued to ESOP	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest	Total
Balance at Mar. 31, 2015	$ 225	$ 65,268	$ 37,830	$ (284)	$ 762	$ 536	$ 104,337
Balance (in shares) at Mar. 31, 2015	22,489,890
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			6,358				6,358
Purchase of subsidiary shares from noncontrolling interest		(919)				(583)	(1,502)
Cash dividend on common stock (($0.105, ($0.08 and $$0.065 per share for MARCH 31, 2018, 2017 and 2016, respectively)			(1,460)				(1,460)
Exercise of stock options		62					$ 62
Exercise of stock options (in shares)	18,000						18,000
Earned ESOP shares		7		103			$ 110
Other comprehensive income (loss), net					321		321
Noncontrolling interest						$ 47	47
Balance at Mar. 31, 2016	$ 225	64,418	42,728	(181)	1,083		108,273
Balance (in shares) at Mar. 31, 2016	22,507,890
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			7,404				7,404
Cash dividend on common stock (($0.105, ($0.08 and $$0.065 per share for MARCH 31, 2018, 2017 and 2016, respectively)			(1,797)				(1,797)
Exercise of stock options		11					$ 11
Exercise of stock options (in shares)	3,000						3,000
Earned ESOP shares		39		104			$ 143
Other comprehensive income (loss), net					(2,770)		(2,770)
Balance at Mar. 31, 2017	$ 225	64,468	48,335	(77)	(1,687)		111,264
Balance (in shares) at Mar. 31, 2017	22,510,890
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			10,242				10,242
Cash dividend on common stock (($0.105, ($0.08 and $$0.065 per share for MARCH 31, 2018, 2017 and 2016, respectively)			(2,367)				(2,367)
Exercise of stock options	$ 1	244					$ 245
Exercise of stock options (in shares)	59,289						59,289
Stock-based compensation expense		88					$ 88
Earned ESOP shares		71		$ 77			148
Other comprehensive income (loss), net					(2,719)		(2,719)
Balance at Mar. 31, 2018	$ 226	$ 64,871	56,552		(4,748)		$ 116,901
Balance (in shares) at Mar. 31, 2018	22,570,179
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of certain stranded income tax effects as a result of change in federal corporate income tax rate (see Note 1)			$ 342		$ (342)