Segment Data (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Segment Reporting Information [Line Items]
Net sales	$ 22,961	$ 20,369
Domestic [Member]
Segment Reporting Information [Line Items]
Net sales	$ 12,700	$ 12,190
Sales Revenue, Percentage	55.31%	59.86%
International [Member]
Segment Reporting Information [Line Items]
Net sales	$ 10,260	$ 8,180
Sales Revenue, Percentage	44.69%	40.14%
Sales Revenue, Net [Member]
Segment Reporting Information [Line Items]
Net sales	$ 22,960	$ 20,370
Sales Revenue, Percentage	100.00%	100.00%