Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Mar. 31, 2019	3,000	20,674,000
Balance at Mar. 31, 2019	$ 9	$ 21	$ 12,478	$ 122,172	$ 134,680
Issuance of restricted stock, net (in shares)	0	105,000
Issuance of restricted stock, net	$ 0	$ 0	0	0	0
Share based compensation	$ 0	$ 0	2,822	0	$ 2,822
Repurchased and retired shares (in shares)	0	(613,000)			(613,000)
Repurchased and retired shares	$ 0	$ (1)	(11,496)	0	$ (11,497)
Dividends declared	0	0	0	(21,846)	(21,846)
Net income	$ 0	$ 0	0	25,851	25,851
Balance (in shares) at Mar. 31, 2020	3,000	20,166,000
Balance at Mar. 31, 2020	$ 9	$ 20	3,804	126,177	130,010
Issuance of restricted stock, net (in shares)	0	103,000
Issuance of restricted stock, net	$ 0	$ 0	0	0	0
Share based compensation	0	0	3,307	0	$ 3,307
Repurchased and retired shares (in shares)					0
Dividends declared	0	0	0	(22,639)	$ (22,639)
Net income	$ 0	$ 0	0	30,603	30,603
Balance (in shares) at Mar. 31, 2021	3,000	20,269,000
Balance at Mar. 31, 2021	$ 9	$ 20	7,111	134,141	141,281
Issuance of restricted stock, net (in shares)	0	710,000
Issuance of restricted stock, net	$ 0	$ 1	0	0	1
Share based compensation	0	0	4,549	0	$ 4,549
Repurchased and retired shares (in shares)					0
Dividends declared	0	0	0	(24,745)	$ (24,745)
Net income	$ 0	$ 0	0	21,100	21,100
Balance (in shares) at Mar. 31, 2022	3,000	20,979,000
Balance at Mar. 31, 2022	$ 9	$ 21	$ 11,660	$ 130,496	$ 142,186