Note 6 - Retirement and Other Benefit Plans - Net Periodic Benefit Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 01, 2020	Feb. 02, 2019	Feb. 03, 2018
Pension Plan [Member]
Service cost	$ 7,219	$ 8,995	$ 9,705
Interest cost	14,811	14,236	14,948
Expected return on assets	27,735	29,091	27,589
Actuarial loss (gain)	3,904	4,122	4,315
Prior service credit	(1,486)	(1,567)	(1,780)
Settlement cost	2,236	324	0
Cost of contractual termination benefits	482	0	0
Curtailments	0	0	(2,165)
Total net periodic benefit income	(569)	(2,981)	(2,566)
Other Postretirement Benefits Plan [Member]
Service cost	0	0	0
Interest cost	60	59	68
Expected return on assets	(0)	(0)	(0)
Actuarial loss (gain)	(107)	(125)	(145)
Prior service credit	0	0	0
Settlement cost	0	0	0
Cost of contractual termination benefits	0	0	0
Curtailments	0	0	0
Total net periodic benefit income	$ (47)	$ (66)	$ (77)