Note 5 - Stock-based Compensation - Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Feb. 27, 2022	Feb. 28, 2021	Mar. 01, 2020	Mar. 03, 2019
Outstanding options (in shares)	634,534	510,634	540,709
Balance, weighted average exercise price (in dollars per share)	$ 12.47	$ 12.45	$ 13.49
Outstanding aggregate intrinsic value	$ 428	$ 730	$ 597	$ 70
Outstanding options, granted (in shares)	147,750	132,100	114,450
Granted, weighted average exercise price (in dollars per share)	$ 13.82	$ 12.55	$ 15.44
Outstanding options, exercised (in shares)	(75,334)	(1,450)	(32,873)
Exercised, weighted average exercise price (in dollars per share)	$ 9.81	$ 8.02	$ 11.64
Outstanding options, terminated or expired (in shares)	(58,650)	(6,750)	(111,652)
Terminated or expired, weighted average exercise price (in dollars per share)	$ 13.96	$ 13.01	$ 15.95
Outstanding options (in shares)	648,300	634,534	510,634
Balance, weighted average exercise price (in dollars per share)	$ 12.96	$ 12.47	$ 12.45
Balance, weighted average remaining contractual term (Year)	5 years 4 months 17 days
Vested and exercisable (in shares)	391,275
Vested and exercisable, weighted average exercise price (in dollars per share)	$ 12.47
Vested and exercisable, weighted average remaining contractual term (Year)	3 years 3 months 25 days
Vested and exercisable, aggregate intrinsic value	$ 450
Expected to vest (in shares)	609,402
Expected to vest, weighted average exercise price (in dollars per share)	$ 12.47
Expected to vest, weighted average remaining contractual term (Year)	5 years 4 months 17 days
Expected to vest, aggregate intrinsic value	$ 701