Note 6 - Capital Stock and Transactions With Related Parties (Details Textual) - USD ($) $ / shares in Units, $ in Thousands					12 Months Ended			96 Months Ended
	Jan. 29, 2021	Jan. 29, 2019	Aug. 04, 2017	Jan. 27, 2017	May 01, 2021	May 02, 2020	Apr. 27, 2019	May 02, 2020	Apr. 30, 2012
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)									3,200,000
Treasury Stock, Shares, Acquired (in shares)						154,512		1,313,144
Treasury Stock, Value, Acquired, Cost Method						$ 6,200
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares)						1,886,856		1,886,856
Payments of Ordinary Dividends, Common Stock	$ 279,900	$ 135,200	$ 69,900	$ 69,900	$ 279,876	$ (0)	$ 135,247
Common Stock, Dividends, Per Share, Cash Paid (in dollars per share)	$ 3.00	$ 1.45	$ 75	$ 75
CMA [Member]
Averaged Operating Costs					1
Averaged Lease Buy-down Payments and Financing Costs					6,000
Related Party Transaction, Amounts of Transaction					10,700	10,000	$ 10,200
Accounts Payable, Total					3,800	$ 2,600		$ 2,600
CMA [Member] | Costs Reimbursable Under Management Agreement [Member]
Accounts Payable, Total					$ 1,200