CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total
Balance at Mar. 31, 2020	$ 225	$ 64,649	$ 81,870	$ 2,099	$ 148,843
Balance (in shares) at Mar. 31, 2020	22,544,285
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			10,472		10,472
Cash dividend on common stock			(4,461)		(4,461)
Exercise of stock options	$ 1	49			$ 50
Exercise of stock options (in shares)	20,000				20,000
Stock repurchased	$ (3)	(1,444)			$ (1,447)
Stock repurchased (in shares)	(295,900)
Restricted stock grants (in shares)	90,763
Restricted stock forfeited (in shares)	(7,913)
Stock-based compensation expense		396			396
Other comprehensive income (loss), net				(2,259)	(2,259)
Balance at Mar. 31, 2021	$ 223	63,650	87,881	(160)	151,594
Balance (in shares) at Mar. 31, 2021	22,351,235
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			21,820		21,820
Cash dividend on common stock			(4,769)		(4,769)
Exercise of stock options		17	(1)		$ 16
Exercise of stock options (in shares)	6,000				6,000
Stock repurchased	$ (2)	(1,938)			$ (1,940)
Stock repurchased (in shares)	(278,148)
Restricted stock grants (in shares)	69,285
Restricted stock forfeited (in shares)	(20,976)
Stock-based compensation expense		319			319
Other comprehensive income (loss), net				(9,791)	(9,791)
Balance at Mar. 31, 2022	$ 221	62,048	104,931	(9,951)	157,249
Balance (in shares) at Mar. 31, 2022	22,127,396
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			18,069		18,069
Cash dividend on common stock			(5,174)		(5,174)
Exercise of stock options		4			$ 4
Exercise of stock options (in shares)	1,511				1,511
Stock repurchased	$ (9)	(6,697)			$ (6,706)
Stock repurchased (in shares)	(975,666)
Restricted stock grants (in shares)	68,719
Stock-based compensation expense		390			390
Purchase of subsidiary shares from noncontrolling interest		(234)			(234)
Other comprehensive income (loss), net				(8,359)	(8,359)
Balance at Mar. 31, 2023	$ 212	$ 55,511	$ 117,826	$ (18,310)	$ 155,239
Balance (in shares) at Mar. 31, 2023	21,221,960