Share Based Compensation (Tables)

6 Months Ended

Jul. 31, 2019

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

The share-based compensation expense was as follows:

	Three Months Ended				Six Months Ended
	July 31, 2019		July 31, 2018		July 31, 2019		July 31, 2018
Cost of sales	$	99	$	103	$	175	$	183
Research and development expenses	46		36		81		67
Selling, general, and administrative expenses	1,621		1,355		2,292		2,031
Total stock-based compensation expense	$	1,766	$	1,494	$	2,548	$	2,281