Note 8 - Retirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020
Interest cost	$ 190	$ 237
Expected return on plan assets	(479)	(450)
Recognized actuarial loss	139	102
Net periodic benefit income	(150)	(111)
Actuarial loss on obligation	(256)	(787)
Actual gain on plan assets	302	246
Amounts recognized in current year	139	102
Total in other comprehensive income	$ (185)	$ 439