Condensed Consolidated Statements of Income Unaudited - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Income Statement [Abstract]
Net sales	$ 70,359	$ 74,802	$ 97,252	$ 97,371
Costs of goods sold	41,620	47,670	59,429	62,554
Gross profit	28,739	27,132	37,823	34,817
Selling, general and administrative expenses	18,557	18,277	31,238	30,431
Gain on sale of property, plant & equipment	3	0	3	(1)
Operating Income	10,179	8,855	6,582	4,387
Pension expense	188	440	376	560
Interest expense	907	822	1,607	1,268
Income (loss) before income taxes	9,084	7,593	4,599	2,559
Income tax (benefit) expense	3,217	2,118	1,799	656
Net income (loss)	$ 5,867	$ 5,475	$ 2,800	$ 1,903
Net income (loss) per common share:
Basic (usd per share)	$ 0.38	$ 0.36	$ 0.18	$ 0.12
Diluted (usd per share)	$ 0.38	$ 0.35	$ 0.18	$ 0.12
Weighted average shares outstanding:
Basic (shares)	15,561	15,392	15,524	15,355
Diluted (shares)	15,568	15,435	15,529	15,395