Note 9 - Retirement Plans - Benefit Obligations, Plan Assets and Funded Status of Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Accumulated benefit obligations
Accumulated benefits	$ 6,959	$ 6,258
Benefit obligation - beginning of year	6,258	6,658
Interest cost	237	240
Actuarial (gain)/loss	788	(303)
Benefits paid	(324)	(337)
Benefit obligation - end of year	6,959	6,258
Fair value of plan assets - beginning of year	6,179	6,700
Actual (loss)/gain on plan assets	695	(184)
Benefits paid	324	337
Fair value of plan assets - end of year	6,550	6,179
Unfunded status	(409)	(80)
Balance sheet classification
Prepaid expenses and other current assets	325	343
Other assets	1,679	1,568
Deferred compensation liabilities	(2,413)	(1,991)
Net amount recognized	(409)	(80)
Amounts recognized in accumulated other comprehensive loss
Unrecognized actuarial loss	2,087	1,648
Net amount recognized	$ 2,087	$ 1,648