Segment Reporting (Details 1) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Jan. 31, 2018
Net sales		$ 24,010	$ 23,960	$ 73,970	$ 70,830
External sales			23,960	73,970	70,830
Intersegment sales			12,200	35,290	31,380
Operating profit (loss)		1,013	2,665	5,077	7,320
Depreciation and amortization expense			200	642	582
Interest expense		25	35	93	147
Income tax expense		494	831	1,634	1,828
Total assets		98,404		98,404		$ 94,531
Total assets less intersegment		98,400		98,400		94,530
Property and equipment		10,286		10,286		8,789
Goodwill		871		871		871
USA
Net sales		13,000	14,160	41,070	41,460
External sales		11,820	12,850	37,540	38,180
Intersegment sales		1,180	1,310	3,530	3,280
Operating profit (loss)		1,660	2,620	6,450	7,400
Depreciation and amortization expense		30	30	90	90
Total assets	[1]	28,090		28,090		67,020
Total assets less intersegment	[1]	29,570		29,570		33,160
Property and equipment		1,950		1,950		1,990
Goodwill		870		870		870
Other Foreign
Net sales		5,740	4,940	16,710	13,660
External sales		4,410	4,390	13,600	12,470
Intersegment sales		1,330	550	3,110	1,190
Operating profit (loss)		340	920	970	2,040
Depreciation and amortization expense		20	40	120	100
Interest expense		10	20	30	50
Income tax expense		170	160	370	420
Total assets	[1]	25,300		25,300		20,300
Total assets less intersegment	[1]	17,550		17,550		12,610
Property and equipment		2,410		2,410		1,500
Europe (UK)
Net sales		2,220	2,240	7,350	6,460
External sales		2,220	2,240	7,350	6,420
Intersegment sales		0	0	0	40
Operating profit (loss)		30	(20)	210	90
Depreciation and amortization expense		0	0	10	10
Interest expense		0	10	0	10
Income tax expense		10	10	50	50
Total assets	[1]	4,190		4,190		4,630
Total assets less intersegment	[1]	4,190		4,190		4,630
Property and equipment		10		10		30
Mexico
Net sales		1,150	900	3,830	2,770
External sales		770	510	2,700	1,660
Intersegment sales		380	390	1,130	1,110
Operating profit (loss)		(30)	(60)	170	(20)
Depreciation and amortization expense		30	30	90	90
Total assets	[1]	5,140		5,140		4,690
Total assets less intersegment	[1]	5,250		5,250		4,840
Property and equipment		2,100		2,100		1,990
China
Net sales		12,050	13,470	39,550	36,880
External sales		4,790	3,970	12,780	12,100
Intersegment sales		7,260	9,500	26,770	24,780
Operating profit (loss)		790	660	2,300	2,210
Depreciation and amortization expense		50	60	170	190
Income tax expense		290	120	810	500
Total assets	[1]	35,230		35,230		31,590
Total assets less intersegment	[1]	18,570		18,570		16,970
Property and equipment		1,750		1,750		1,920
Corporate
Net sales		0	450	750	980
Intersegment sales		0	450	750	980
Operating profit (loss)		(1,610)	(1,460)	(4,960)	(4,560)
Depreciation and amortization expense		90	50	190	140
Interest expense		20	10	60	90
Income tax expense		50	550	390	830
Total assets	[1]	63,910		63,910		22,270
Total assets less intersegment	[1]	22,170		22,170		21,340
Property and equipment		1,840		1,840		1,180
Intersegment
Net sales		(10,150)	(12,200)	(35,290)	(31,380)
Operating profit (loss)		(170)	10	(60)	160
Depreciation and amortization expense		0	(10)	(30)	(40)
Income tax expense		(30)	$ (10)	10	$ 30
Total assets	[1]	(62,630)		(62,630)		(55,120)
Property and equipment		60		60		30
India
Total assets	[1]	830		830		(850)
Total assets less intersegment	[1]	1,100		1,100		980
Property and equipment		$ 170		$ 170		$ 150

[1] Negative assets reflect intersegment amounts eliminated in consolidation.