Note 10 - Employee Benefit Plans (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Number of Days	30 days
Years of Age	18 years
Defined Contribution Plans Vesting Period	4 years
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	100.00%
Defined Contribution Plan Percent of Employee Contribution	5.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 0	$ 0
Minimum [Member]
Defined Contribution Plan Employee Contribution	1.00%
Maximum [Member]
Defined Contribution Plan Employee Contribution	20.00%