CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Non-controlling Interests	Total
Balances at Jan. 31, 2020	$ 2,346	$ 148,713	$ 189,306	$ (1,116)	$ 1,781	$ 341,030
Balances (in shares) at Jan. 31, 2020	15,634,969
Net income (loss)			4,846		(40)	4,806
Foreign currency translation loss				(329)		(329)
Stock compensation expense		1,414				1,414
Stock option exercises and other share-based award settlements	$ 5	720				725
Stock option exercises and other share-based award settlements (in shares)	35,000
Cash dividends			(23,499)			(23,499)
Balances at Jul. 31, 2020	$ 2,351	150,847	170,653	(1,445)	1,741	324,147
Balances (in shares) at Jul. 31, 2020	15,669,969
Balances at Apr. 30, 2020	$ 2,347	149,531	184,633	(1,362)	1,751	336,900
Balances (in shares) at Apr. 30, 2020	15,644,969
Net income (loss)			5,609		(10)	5,599
Foreign currency translation loss				(83)		(83)
Stock compensation expense		772				772
Stock option exercises and other share-based award settlements	$ 4	544				548
Stock option exercises and other share-based award settlements (in shares)	25,000
Cash dividends			(19,589)			(19,589)
Balances at Jul. 31, 2020	$ 2,351	150,847	170,653	(1,445)	1,741	324,147
Balances (in shares) at Jul. 31, 2020	15,669,969
Retained earnings						166,110
Balances at Jan. 31, 2021	$ 2,356	153,282	166,110	(1,081)	1,741	322,408
Balances (in shares) at Jan. 31, 2021	15,702,969
Net income (loss)			23,636			23,636
Foreign currency translation loss				(257)		(257)
Stock compensation expense		1,609				1,609
Stock option exercises and other share-based award settlements	$ 10	1,013				$ 1,023
Stock option exercises and other share-based award settlements (in shares)	66,471					26,000
Cash dividends			(7,884)			$ (7,884)
Balances at Jul. 31, 2021	$ 2,366	155,904	181,862	(1,338)	1,741	340,535
Balances (in shares) at Jul. 31, 2021	15,769,440
Balances at Apr. 30, 2021	$ 2,366	154,974	172,934	(1,199)	1,741	330,816
Balances (in shares) at Apr. 30, 2021	15,769,440
Net income (loss)			12,870			12,870
Foreign currency translation loss				(139)		(139)
Stock compensation expense		930				930
Cash dividends			(3,942)			(3,942)
Balances at Jul. 31, 2021	$ 2,366	$ 155,904	$ 181,862	$ (1,338)	$ 1,741	340,535
Balances (in shares) at Jul. 31, 2021	15,769,440
Retained earnings						$ 181,862