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)			14,300		(40)	14,260
Foreign currency translation loss				(650)		(650)
Stock compensation expense		2,199				2,199
Stock option exercises and other share-based award settlements	$ 8	1,237				1,245
Stock option exercises and other share-based award settlements (in shares)	55,000
Cash dividends			(27,420)			(27,420)
Balances at Oct. 31, 2020	$ 2,354	152,149	176,186	(1,766)	1,741	330,664
Balances (in shares) at Oct. 31, 2020	15,689,969
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
Net income (loss)			9,454			9,454
Foreign currency translation loss				(321)		(321)
Stock compensation expense		786				786
Stock option exercises and other share-based award settlements	$ 3	516				519
Stock option exercises and other share-based award settlements (in shares)	20,000
Cash dividends			(3,921)			(3,921)
Balances at Oct. 31, 2020	$ 2,354	152,149	176,186	(1,766)	1,741	330,664
Balances (in shares) at Oct. 31, 2020	15,689,969
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)			36,029			36,029
Foreign currency translation loss				(728)		(728)
Stock compensation expense		2,521				2,521
Stock option exercises and other share-based award settlements	$ 12	1,384				$ 1,396
Stock option exercises and other share-based award settlements (in shares)	81,471					41,000
Cash dividends			(11,831)			$ (11,831)
Balances at Oct. 31, 2021	$ 2,368	157,187	190,308	(1,809)	1,741	349,795
Balances (in shares) at Oct. 31, 2021	15,784,440
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
Net income (loss)			12,393			12,393
Foreign currency translation loss				(471)		(471)
Stock compensation expense		913				913
Stock option exercises and other share-based award settlements	$ 2	370				372
Stock option exercises and other share-based award settlements (in shares)	15,000
Cash dividends			(3,947)			(3,947)
Balances at Oct. 31, 2021	$ 2,368	$ 157,187	$ 190,308	$ (1,809)	$ 1,741	349,795
Balances (in shares) at Oct. 31, 2021	15,784,440
Retained earnings						$ 190,308