Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020	Jan. 31, 2020
Operating profit	$ 3,927	$ 9,734	$ 10,165	$ 22,104
Total [Member]
Net sales	27,470	35,020	61,560	80,600
External sales	27,470	35,020	61,560	80,600
Intersegment sales	14,710	29,230	17,630	30,920
Operating profit	3,930	9,730	10,170	22,100
Total assets less intersegment	143,000		143,000		$ 139,920
USA [Member]
Net sales	11,300	15,550	27,710	39,680
External sales	10,160	14,450	25,850	37,560
Intersegment sales	1,150	1,100	1,880	2,120
Operating profit	(1,100)	1,370	830	5,700
Total assets less intersegment	46,850		46,850		52,310
Other Foreign [Member]
Net sales	2,550	2,380	5,010	5,420
External sales	1,750	2,020	3,330	4,320
Intersegment sales	800	360	1,680	1,100
Operating profit	430	1,170	1,000	2,400
Total assets less intersegment	8,480		8,480		8,370
Europe (UK) [Member]
Net sales	2,690	4,160	7,090	7,170
External sales	2,690	4,160	7,090	7,170
Operating profit	150	1,140	1,750	1,600
Total assets less intersegment	10,730		10,730		11,330
Mexico [Member]
Net sales	1,060	910	2,870	2,730
External sales	750	610	2,300	1,980
Intersegment sales	300	300	560	750
Operating profit	(380)	(200)	(330)	20
Total assets less intersegment	5,560		5,560		5,620
Asia [Member]
Net sales	19,270	24,150	37,460	44,170
External sales	6,930	8,400	12,570	17,450
Intersegment sales	12,340	15,750	24,890	26,720
Operating profit	3,030	4,960	6,380	9,470
Total assets less intersegment	55,080		55,080		47,290
Canada [Member]
Net sales	2,080	2,400	3,860	6,710
External sales	2,080	2,400	3,860	6,710
Operating profit	290	260	760	1,390
Total assets less intersegment	8,070		8,070		8,030
Latin America [Member]
Net sales	3,230	3,100	6,790	5,640
External sales	3,110	2,980	6,560	5,410
Intersegment sales	120	120	220	230
Operating profit	770	1,120	1,670	1,690
Total assets less intersegment	8,230		8,230		$ 6,970
Intersegment [Member]
Net sales	(14,710)	(17,630)	(29,230)	(30,920)
Operating profit	$ 740	$ (90)	$ (230)	$ (170)