Note 8 - Retirement Plans - Benefit Obligations, Plan Assets and Funded Status of Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Accumulated benefits	$ 7,090	$ 6,959
Benefit obligation - beginning of year	6,959	6,258
Interest cost	190	237
Actuarial loss	256	788
Benefits paid	(315)	(324)
Benefit obligation - end of year	7,090	6,959
Fair value of plan assets - beginning of year	6,550	6,179
Actual gain on plan assets	781	695
Benefits paid	315	324
Fair value of plan assets - end of year	7,016	6,550
Unfunded status	(74)	(409)
Prepaid expenses and other current assets	332	325
Other assets	1,828	1,679
Deferred compensation liabilities	(2,234)	(2,413)
Net amount recognized	(74)	(409)
Unrecognized actuarial loss	1,902	2,087
Net amount recognized	$ 1,902	$ 2,087