Segment Reporting (Details 1) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Jan. 31, 2018
Net sales		$ 25,616	$ 23,909	$ 49,960	$ 46,870
External sales		25,616	23,909	49,960	46,870
Intersegment sales		12,820	10,700	25,140	19,180
Operating profit (loss)		1,646	2,182	4,063	4,654
Depreciation and amortization expense		240	200	428	385
Interest expense		37	36	68	112
Income tax expense		622	308	1,139	996
Capital expenditures				1,220	450
Total assets		98,401		98,401		$ 94,531
Total assets less intersegment		98,400		98,400		94,530
Property and equipment		9,524		9,524		8,789
Goodwill		871		871		871
USA
Net sales		14,760	13,900	28,070	27,300
External sales		13,360	12,630	25,710	25,330
Intersegment sales		1,400	1,270	2,360	1,970
Operating profit (loss)		2,150	2,520	4,780	4,780
Depreciation and amortization expense		30	30	60	60
Capital expenditures				20	10
Total assets	[1]	71,370		71,370		67,020
Total assets less intersegment	[1]	34,530		34,530		33,160
Property and equipment		1,950		1,950		1,990
Goodwill		870		870		870
Other Foreign
Net sales		5,860	4,680	10,970	8,730
External sales		4,840	4,380	9,200	8,080
Intersegment sales		1,020	300	1,770	650
Operating profit (loss)		60	670	620	1,100
Depreciation and amortization expense		70	30	110	70
Interest expense		20	10	30	30
Income tax expense		120	210	210	260
Capital expenditures				710	0
Total assets	[1]	23,340		23,340		20,300
Total assets less intersegment	[1]	15,710		15,710		12,610
Property and equipment		2,060		2,060		1,500
Europe (UK)
Net sales		2,560	2,080	5,130	4,210
External sales		2,560	2,080	5,130	4,170
Intersegment sales		0	0	0	40
Operating profit (loss)		90	40	180	110
Depreciation and amortization expense		0	0	10	0
Income tax expense		20	30	40	40
Total assets	[1]	4,490		4,490		4,630
Total assets less intersegment	[1]	4,490		4,490		4,630
Property and equipment		20		20		30
Mexico
Net sales		1,210	950	2,680	1,870
External sales		820	580	1,930	1,150
Intersegment sales		390	370	750	720
Operating profit (loss)		80	10	210	40
Depreciation and amortization expense		30	30	60	60
Capital expenditures				110	30
Total assets	[1]	5,220		5,220		4,690
Total assets less intersegment	[1]	5,310		5,310		4,840
Property and equipment		2,040		2,040		1,990
China
Net sales		13,660	12,890	27,500	23,410
External sales		4,040	4,240	7,990	8,140
Intersegment sales		9,620	8,650	19,510	15,270
Operating profit (loss)		930	580	1,510	1,550
Depreciation and amortization expense		70	70	120	130
Interest expense		0	0	0	0
Income tax expense		360	90	510	380
Capital expenditures				30	60
Total assets	[1]	34,710		34,710		31,590
Total assets less intersegment	[1]	20,270		20,270		16,970
Property and equipment		1,810		1,810		1,920
India
Capital expenditures				60	20
Total assets	[1]	(780)		(780)		(850)
Total assets less intersegment	[1]	1,140		1,140		980
Property and equipment		180		180		150
Corporate
Net sales		390	110	750	530
Intersegment sales		390	110	750	530
Operating profit (loss)		(1,560)	(1,720)	(3,350)	(3,100)
Depreciation and amortization expense		50	50	100	90
Interest expense		20	20	40	80
Income tax expense		150	(40)	340	280
Capital expenditures				290	330
Total assets	[1]	17,760		17,760		22,270
Total assets less intersegment	[1]	16,950		16,950		21,340
Property and equipment		1,400		1,400		1,180
Intersegment
Net sales		(12,820)	(10,700)	(25,140)	(19,180)
Operating profit (loss)		(100)	80	110	170
Depreciation and amortization expense		(10)	(10)	(30)	(20)
Income tax expense		(30)	$ 20	40	$ 40
Total assets	[1]	(57,710)		(57,710)		(55,120)
Property and equipment		$ 60		$ 60		$ 30

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