CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comp. Income (Loss)	Total
Balance at Mar. 31, 2012	$ 5,961	$ 95,971	$ 156,858	$ 16	$ 258,806
Balance (in shares) at Mar. 31, 2012	8,942,793
Increase (decrease) in stockholders' equity
Net income			17,454		17,454
Repurchase of common stock	(675)	(56,958)			(57,633)
Repurchase of common stock (in shares)	(1,013,655)
Exercise of stock options	34	2,126			2,160
Exercise of stock options (in shares)	50,505
Vesting of restricted stock units	1	(1)
Vesting of restricted stock units (in shares)	1,743
Issuances of restricted stock, net of forfeitures	(1)	1
Issuances of restricted stock, net of forfeitures (in shares)	(1,184)
Tax benefit accrued on stock option exercises		135			135
Compensation expense on stock options		(106)			(106)
Compensation expense on restricted stock and restricted stock units		290			290
Dividends declared			(16,841)		(16,841)
Net change in unrealized gains ( losses) on investment securities, available-for-sale, net of tax				(20)	(20)
Balance at Mar. 31, 2013	5,320	41,458	157,471	(4)	204,245
Balance (in shares) at Mar. 31, 2013	7,980,202
Increase (decrease) in stockholders' equity
Net income			15,117		15,117
Repurchase of common stock	(134)	(12,172)			(12,306)
Repurchase of common stock (in shares)	(201,192)
Exercise of stock options	56	3,469			3,525
Exercise of stock options (in shares)	84,853
Vesting of restricted stock units	5	(5)
Vesting of restricted stock units (in shares)	7,307
Issuances of restricted stock, net of forfeitures	8	(8)
Issuances of restricted stock, net of forfeitures (in shares)	12,845
Tax benefit accrued on stock option exercises		9			9
Stock-based compensation		2,485	16		2,501
Dividends declared			(15,713)		(15,713)
Net change in unrealized gains ( losses) on investment securities, available-for-sale, net of tax				17	17
Balance at Mar. 31, 2014	5,255	35,236	156,891	13	197,395
Balance (in shares) at Mar. 31, 2014	7,884,015				7,884,015
Increase (decrease) in stockholders' equity
Net income			979		979
Repurchase of common stock	(495)	(35,977)			(36,472)
Repurchase of common stock (in shares)	(743,099)
Exercise of stock options	18	1,056			1,074
Exercise of stock options (in shares)	26,224
Vesting of restricted stock units	11	(11)
Vesting of restricted stock units (in shares)	16,875
Issuances of restricted stock, net of forfeitures	6	(6)
Issuances of restricted stock, net of forfeitures (in shares)	9,232
Tax benefit accrued on stock option exercises		291			291
Stock-based compensation		2,745	26		2,771
Dividends declared			(15,607)		(15,607)
Net change in unrealized gains ( losses) on investment securities, available-for-sale, net of tax				(24)	(24)
Balance at Mar. 31, 2015	$ 4,795	$ 3,334	$ 142,289	$ (11)	$ 150,407
Balance (in shares) at Mar. 31, 2015	7,193,247				7,193,247