Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common stock [Member]	Treasury stock [Member]	Capital in excess of Stated value [Member]	Retained earnings [Member]	Accumulated other comprehensive income (loss) [Member]
Beginning balance at Mar. 31, 2024	$ 236,477	$ 10,003	$ (1,791)	$ 94,680	$ 137,755	$ (4,170)
Beginning balance (in shares) at Mar. 31, 2024		33,342
Beginning balance (in shares) at Mar. 31, 2024			(5,965)
Share-based compensation	8,727			8,727
Shares issued upon exercise of SSARs			$ 164	(164)
Shares issued upon exercise of SSARs ( in shares)			545
Shares withheld for taxes upon exercise of SSARs or vesting of other grants	(1,416)		$ (5)	(1,411)
Shares withheld for taxes upon exercise of SSARs or vesting of other grants (in shares)			(16)
Other common stock issuances, net	453		$ 10	443
Other common stock issuances, net (in shares)			34
Net income	15,470				15,470
Unrealized translation adjustments	551					551
Ending balance at Sep. 30, 2024	260,262	$ 10,003	$ (1,622)	102,275	153,225	(3,619)
Ending balance (in shares) at Sep. 30, 2024		33,342
Ending balance (in shares) at Sep. 30, 2024			(5,402)
Beginning balance at Jun. 30, 2024	254,171	$ 10,003	$ (1,642)	98,277	151,861	(4,328)
Beginning balance (in shares) at Jun. 30, 2024		33,342
Beginning balance (in shares) at Jun. 30, 2024			(5,470)
Share-based compensation	3,877			3,877
Shares issued upon exercise of SSARs			$ 14	(14)
Shares issued upon exercise of SSARs ( in shares)			47
Shares withheld for taxes upon exercise of SSARs or vesting of other grants	(312)		$ (1)	(311)
Shares withheld for taxes upon exercise of SSARs or vesting of other grants (in shares)			(2)
Other common stock issuances, net	453		$ 7	446
Other common stock issuances, net (in shares)			23
Net income	1,364				1,364
Unrealized translation adjustments	709					709
Ending balance at Sep. 30, 2024	260,262	$ 10,003	$ (1,622)	102,275	153,225	(3,619)
Ending balance (in shares) at Sep. 30, 2024		33,342
Ending balance (in shares) at Sep. 30, 2024			(5,402)
Beginning balance at Mar. 31, 2025	$ 265,886	$ 10,003	$ (1,600)	109,785	160,980	(13,282)
Beginning balance (in shares) at Mar. 31, 2025		33,342
Beginning balance (in shares) at Mar. 31, 2025	5,326,513		(5,327)
Share-based compensation	$ 10,224			10,224
Shares issued upon exercise of SSARs			$ 5	(5)
Shares issued upon exercise of SSARs ( in shares)			19
Shares withheld for taxes upon exercise of SSARs or vesting of other grants	75		$ (1)	76
Shares withheld for taxes upon exercise of SSARs or vesting of other grants (in shares)			(2)
Other common stock issuances, net	777		$ 3	774
Other common stock issuances, net (in shares)			10
Net income	16,600				16,600
Unrealized translation adjustments	3,185					3,185
Ending balance at Sep. 30, 2025	$ 296,747	$ 10,003	$ (1,593)	120,854	177,580	(10,097)
Ending balance (in shares) at Sep. 30, 2025		33,342
Ending balance (in shares) at Sep. 30, 2025	5,299,670		(5,300)
Beginning balance at Jun. 30, 2025	$ 283,219	$ 10,003	$ (1,595)	114,996	165,870	(6,055)
Beginning balance (in shares) at Jun. 30, 2025		33,342
Beginning balance (in shares) at Jun. 30, 2025			(5,307)
Share-based compensation	4,848			4,848
Shares issued upon exercise of SSARs ( in shares)			1
Shares withheld for taxes upon exercise of SSARs or vesting of other grants	235			235
Shares withheld for taxes upon exercise of SSARs or vesting of other grants (in shares)			(1)
Other common stock issuances, net	777		$ 2	775
Other common stock issuances, net (in shares)			7
Net income	11,710				11,710
Unrealized translation adjustments	(4,042)					(4,042)
Ending balance at Sep. 30, 2025	$ 296,747	$ 10,003	$ (1,593)	$ 120,854	$ 177,580	$ (10,097)
Ending balance (in shares) at Sep. 30, 2025		33,342
Ending balance (in shares) at Sep. 30, 2025	5,299,670		(5,300)