CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Income Statement [Abstract]
Net sales	$ 45,582	$ 24,684
Cost of goods sold	23,438	17,130
Gross profit	22,144	7,554
Operating expenses	9,774	7,869
Operating profit (loss)	12,370	(315)
Other income (expense), net	6	(27)
Interest expense	(17)	(34)
Income (loss) before taxes	12,359	(376)
Income tax expense	3,725	89
Net income (loss)	$ 8,634	$ (465)
Net income (loss) per common share:
Basic	$ 1.08	$ (0.06)
Diluted	$ 1.07	$ (0.06)
Weighted average common shares outstanding:
Basic	7,972,423	8,013,840
Diluted	8,044,849	8,013,840