Stock-Based Compensation (Details) - $ / shares	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Schedule of transactions for stock options under Plan
Outstanding Option Beginning Balance	859,358	699,600	616,220
Options granted	161,205	200,346	126,880
Options exercised	(85,600)	(40,588)	(28,450)
Options cancelled	(173,262)		(15,050)
Outstanding Option Ending Balance	761,701	859,358	699,600
Weighted Average Exercise Price, Beginning Balance	$ 29.83	$ 30.41	$ 30.08
Options granted, Weighted Average Exercise Price	23.35	26.97	30.36
Options exercised, Weighted Average Exercise Price	23.18	25.68	21.49
Options cancelled, Weighted Average Exercise Price	30.21		33.32
Weighted Average Exercise Price, Ending Balance	$ 29.12	$ 29.83	$ 30.41