CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Total
Balances at Jan. 31, 2023	$ 2,374	$ 162,208	$ 207,832	$ (88,641)	$ (2,876)	$ 280,897
Balances (in shares) at Jan. 31, 2023	13,441,590
Net income			20,340			20,340
Foreign currency translation loss					(627)	(627)
Net unrealized losses on available-for-sale securities					(1,147)	(1,147)
Stock compensation expense		3,416				3,416
Stock option exercises and restricted stock unit settlements, net		(2,470)		3,577		1,107
Stock option exercises and restricted stock unit settlements, net (in shares)	103,598
Common stock repurchases				(8,467)		$ (8,467)
Common stock repurchases (in shares)	(212,441)					(212,441)
Cash dividends			(10,686)			$ (10,686)
Balances at Oct. 31, 2023	$ 2,374	163,154	217,486	(93,531)	(4,650)	284,833
Balances (in shares) at Oct. 31, 2023	13,332,747
Balances at Jul. 31, 2023	$ 2,374	162,323	216,009	(92,329)	(3,341)	285,036
Balances (in shares) at Jul. 31, 2023	13,353,653
Net income			5,464			5,464
Foreign currency translation loss					(882)	(882)
Net unrealized losses on available-for-sale securities					(427)	(427)
Stock compensation expense		1,198				1,198
Stock option exercises and restricted stock unit settlements, net		(367)		527		160
Stock option exercises and restricted stock unit settlements, net (in shares)	21,747
Common stock repurchases				(1,729)		(1,729)
Common stock repurchases (in shares)	(42,653)
Cash dividends			(3,987)			(3,987)
Balances at Oct. 31, 2023	$ 2,374	163,154	217,486	(93,531)	(4,650)	284,833
Balances (in shares) at Oct. 31, 2023	13,332,747
Balances at Jan. 31, 2024	$ 2,374	164,183	225,507	(97,528)	(3,597)	290,939
Balances (in shares) at Jan. 31, 2024	13,242,520
Net income			54,090			54,090
Foreign currency translation loss					(1,933)	(1,933)
Net unrealized losses on available-for-sale securities					(169)	(169)
Stock compensation expense		3,390				$ 3,390
Stock option exercises and restricted stock unit settlements (in shares)						800,000
Stock option exercises and restricted stock unit settlements, net		868		(4,572)		$ (3,704)
Stock option exercises and restricted stock unit settlements, net (in shares)	337,884
Common stock repurchases				(646)		$ (646)
Common stock repurchases (in shares)	(11,300)					(11,300)
Cash dividends			(13,263)			$ (13,263)
Balances at Oct. 31, 2024	$ 2,374	168,441	266,334	(102,746)	(5,699)	328,704
Balances (in shares) at Oct. 31, 2024	13,569,104
Balances at Jul. 31, 2024	$ 2,374	165,902	243,519	(99,644)	(4,083)	308,068
Balances (in shares) at Jul. 31, 2024	13,497,550
Net income			28,010			28,010
Foreign currency translation loss					(957)	(957)
Net unrealized losses on available-for-sale securities					(659)	(659)
Stock compensation expense		1,175				1,175
Stock option exercises and restricted stock unit settlements, net		1,364		(2,643)		(1,279)
Stock option exercises and restricted stock unit settlements, net (in shares)	77,254
Common stock repurchases				(459)		(459)
Common stock repurchases (in shares)	(5,700)
Cash dividends			(5,195)			(5,195)
Balances at Oct. 31, 2024	$ 2,374	$ 168,441	$ 266,334	$ (102,746)	$ (5,699)	$ 328,704
Balances (in shares) at Oct. 31, 2024	13,569,104