Note 6 - Stock-based Compensation - Option Activity (Details)	3 Months Ended
	May 27, 2018 $ / shares shares
Outstanding options (in shares) | shares	885,554
Balance, weighted average exercise price (in dollars per share) | $ / shares	$ 17.55
Outstanding options, granted (in shares) | shares	2,650
Granted, weighted average exercise price (in dollars per share) | $ / shares	$ 17.75
Outstanding options, exercised (in shares) | shares	(2,987)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 15.80
Outstanding options, terminated or expired (in shares) | shares	(9,963)
Terminated or expired, weighted average exercise price (in dollars per share) | $ / shares	$ 17.49
Outstanding options (in shares) | shares	875,254
Balance, weighted average exercise price (in dollars per share) | $ / shares	$ 17.56
Balance, weighted average remaining contractual term (Year)	4 years 262 days
Vested and exercisable (in shares) | shares	744,917
Vested and exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 18.25
Vested and exercisable, weighted average remaining contractual term (Year)	4 years 109 days