Unaudited Consolidated Statements of Changes in Equity and Accumulated Other Comprehensive Income (Loss) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Beginning balance (shares) at Jan. 31, 2019		15,541,956
Beginning balance at Jan. 31, 2019	$ 57,027	$ 155	$ 118,106	$ (52,192)	$ (9,042)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,692			6,692
Pension adjustments, net of tax effect	390				390
Shares vested and others (shares)		171,593
Shares vested and others	(246)	$ 2	(248)
Stock compensation expense	$ 686		686
Ending balance (shares) at Oct. 31, 2019	15,713,549	15,713,549
Ending balance at Oct. 31, 2019	$ 64,549	$ 157	118,544	(45,500)	(8,652)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Pension adjustments, tax	137
Beginning balance (shares) at Jul. 31, 2019		15,713,549
Beginning balance at Jul. 31, 2019	60,265	$ 157	118,282	(49,392)	(8,782)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,892			3,892
Pension adjustments, net of tax effect	130				130
Shares vested and others (shares)		0
Shares vested and others	0	$ 0	0
Stock compensation expense	$ 262		262
Ending balance (shares) at Oct. 31, 2019	15,713,549	15,713,549
Ending balance at Oct. 31, 2019	$ 64,549	$ 157	118,544	(45,500)	(8,652)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Pension adjustments, tax	$ 45
Beginning balance (shares) at Jan. 31, 2020	15,713,549	15,713,549
Beginning balance at Jan. 31, 2020	$ 54,818	$ 157	118,782	(49,810)	(14,311)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,335			3,335
Pension adjustments, net of tax effect	1,031				1,031
Shares vested and others (shares)		205,093
Shares vested and others	(137)	$ 2	(139)
Stock compensation expense	$ 759		759
Ending balance (shares) at Oct. 31, 2020	15,918,642	15,918,642
Ending balance at Oct. 31, 2020	$ 59,806	$ 159	119,402	(46,475)	(13,280)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Pension adjustments, tax	364
Beginning balance (shares) at Jul. 31, 2020		15,918,642
Beginning balance at Jul. 31, 2020	54,732	$ 159	119,149	(50,955)	(13,621)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,480			4,480
Pension adjustments, net of tax effect	341				341
Shares vested and others (shares)		0
Shares vested and others	0	$ 0	0
Stock compensation expense	$ 253		253
Ending balance (shares) at Oct. 31, 2020	15,918,642	15,918,642
Ending balance at Oct. 31, 2020	$ 59,806	$ 159	$ 119,402	$ (46,475)	$ (13,280)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Pension adjustments, tax	$ 124