Segment Reporting (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021	Apr. 30, 2022	Jan. 31, 2022
External sales	$ 28,180,000	$ 27,470,000	$ 55,460,000	$ 61,560,000
Total [Member]
Net sales	28,180,000	27,470,000	55,460,000	61,560,000
External sales	28,180,000	27,470,000	55,460,000	61,560,000
Intersegment sales	15,190,000	14,710,000	24,390,000	29,230,000
Operating profit	18,000	40,700.00	32,400	107,000
Total assets less intersegment					$ 141,460,000	$ 140,790,000
USA [Member]
Net sales	13,430,000	11,300,000	25,680,000	27,710,000
External sales	11,900,000	10,160,000	23,130,000	25,850,000
Intersegment sales	1,530,000	1,150,000	2,550,000	1,880,000
Operating profit	(12,400)	(11,000)	(33,000)	8,300
Total assets less intersegment					50,570,000	53,360,000
Other Foreign [Member]
Net sales	2,430,000	2,550,000	4,620,000	5,010,000.00
External sales	1,830,000	1,750,000	3,640,000	3,330,000
Intersegment sales	600,000	800,000	980,000	1,680,000
Operating profit	700.00	4,300	1,400	10,000.00
Total assets less intersegment					8,550,000	8,920,000
Europe (UK) [Member]
Net sales	1,880,000	2,690,000	3,850,000	7,090,000.00
External sales	1,880,000	2,690,000	3,850,000	7,090,000.00
Operating profit	(3,600)	1,500	(6,200)	17,500
Total assets less intersegment					7,800,000	8,790,000
Mexico [Member]
Net sales	1,500,000	1,060,000.00	2,740,000	2,870,000
External sales	1,060,000.00	750,000	1,910,000	2,300,000
Intersegment sales	440,000	300,000	830,000	560,000
Operating profit	(700.00)	(3,800)	(6,100)	(3,300)
Total assets less intersegment					5,020,000.00	5,060,000.00
Asia [Member]
Net sales	19,320,000	19,270,000	33,980,000	37,460,000
External sales	6,740,000	6,930,000	13,980,000	12,570,000
Intersegment sales	12,580,000	12,340,000	20,000,000.00	24,890,000
Operating profit	34,000	31,700	59,500	66,400
Total assets less intersegment					54,650,000	52,260,000
Canada [Member]
Net sales	2,260,000	2,080,000.00	4,530,000	3,860,000
External sales	2,260,000	2,080,000.00	4,530,000	3,860,000
Operating profit	3,200	2,900	9,500	7,600
Total assets less intersegment					6,640,000	4,990,000
Latin America [Member]
Net sales	2,550,000	3,230,000	4,450,000	6,790,000
External sales	2,510,000	3,110,000	4,420,000	6,560,000
Intersegment sales	40,000.00	120,000	30,000.00	220,000
Operating profit	5,400	7,700	8,400	16,700
Total assets less intersegment					$ 8,230,000	$ 7,410,000
Intersegment [Member]
Net sales	(15,190,000)	(14,710,000)	(24,390,000)	(29,230,000)
Operating profit	$ (7,200)	$ 7,400	$ (1,100)	$ 400.00