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			11,707				11,707
Foreign currency translation gain (loss)					(1,951)		(1,951)
Stock compensation expense		1,979					1,979
Stock option exercises and other share-based award settlements	$ 6	60					66
Stock option exercises and other share-based award settlements (in shares)	39,099
Common stock repurchases				(53,168)			$ (53,168)
Common stock repurchases (in shares)	(1,412,592)						(1,412,592)
Cash dividends			(7,192)				$ (7,192)
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
Balances at Apr. 30, 2022	$ 2,374	159,170	192,463	(47,482)	(3,715)	(797)	302,013
Balances (in shares) at Apr. 30, 2022	14,585,908
Net income			4,222				4,222
Foreign currency translation gain (loss)					(687)		(687)
Stock compensation expense		1,059					1,059
Common stock repurchases				(26,091)			(26,091)
Common stock repurchases (in shares)	(701,713)
Cash dividends			(3,480)				(3,480)
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
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			14,876				14,876
Foreign currency translation gain (loss)					255		255
Net unrealized losses on available-for-sale securities					(720)		(720)
Stock compensation expense		2,218					2,218
Stock option exercises and other share-based award settlements		(2,103)		3,050			$ 947
Stock option exercises and other share-based award settlements (in shares)	81,851						45,000
Common stock repurchases				(6,738)			$ (6,738)
Common stock repurchases (in shares)	(169,788)						(169,788)
Cash dividends			(6,699)				$ (6,699)
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
Balances at Apr. 30, 2023	$ 2,374	161,347	206,584	(89,883)	(2,473)		277,949
Balances (in shares) at Apr. 30, 2023	13,414,404
Net income			12,767				12,767
Foreign currency translation gain (loss)					(185)		(185)
Net unrealized losses on available-for-sale securities					(683)		(683)
Stock compensation expense		1,184					1,184
Stock option exercises and other share-based award settlements		(208)		611			403
Stock option exercises and other share-based award settlements (in shares)	16,381
Common stock repurchases				(3,057)			(3,057)
Common stock repurchases (in shares)	(77,132)
Cash dividends			(3,342)				(3,342)
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