Retirement plans Plan assets (Tables)

12 Months Ended

Jan. 31, 2017

Compensation and Retirement Disclosure [Abstract]

Schedule of Allocation of Plan Assets [Table Text Block]

Level 1 market value of plan assets	2016	2015
Equity securities	$3,000	$3,062
U.S. bond market	2,188	2,168
Real estate securities	214	—
Subtotal	5,402	5,230
Level 2 significant other observable inputs
Money market fund	$306	$351
Equity securities	520	302
Subtotal	826	653
Total	$6,228	$5,883