CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Non-controlling Interests	Total
Balances at Jan. 31, 2022	$ 2,368	$ 158,190	$ 188,690	$ (20,405)	$ (2,451)	$ (797)	$ 325,595
Balances (in shares) at Jan. 31, 2022	15,257,688
Net income			19,465				19,465
Foreign currency translation loss					(2,601)		(2,601)
Stock compensation expense		3,055					3,055
Stock option exercises and restricted stock unit settlements, net of shares withheld for exercise price and withholding taxes	$ 6	60					66
Stock option exercises and restricted stock unit settlements, net of shares withheld for exercise price and withholding taxes (in shares)	39,099
Common stock repurchases				(63,252)			$ (63,252)
Common stock repurchases (in shares)	(1,721,015)						(1,721,015)
Cash dividends			(10,588)				$ (10,588)
Balances at Oct. 31, 2022	$ 2,374	161,305	197,567	(83,657)	(5,052)	(797)	271,740
Balances (in shares) at Oct. 31, 2022	13,575,772
Balances at Jul. 31, 2022	$ 2,374	160,229	193,205	(73,573)	(4,402)	(797)	277,036
Balances (in shares) at Jul. 31, 2022	13,884,195
Net income			7,758				7,758
Foreign currency translation loss					(650)		(650)
Stock compensation expense		1,076					1,076
Common stock repurchases				(10,084)			(10,084)
Common stock repurchases (in shares)	(308,423)
Cash dividends			(3,396)				(3,396)
Balances at Oct. 31, 2022	$ 2,374	161,305	197,567	(83,657)	(5,052)	$ (797)	271,740
Balances (in shares) at Oct. 31, 2022	13,575,772
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 of shares withheld for exercise price and withholding taxes		(2,470)		3,577			1,107
Stock option exercises and restricted stock unit settlements, net of shares withheld for exercise price and withholding taxes (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 of shares withheld for exercise price and withholding taxes		(367)		527			160
Stock option exercises and restricted stock unit settlements, net of shares withheld for exercise price and withholding taxes (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