Note 6 - Stock-based Compensation - Option Activity (Details)	9 Months Ended
	Nov. 25, 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	(37,837)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 17.50
Outstanding options, terminated or expired (in shares) | shares	(101,463)
Terminated or expired, weighted average exercise price (in dollars per share) | $ / shares	$ 19.59
Outstanding options (in shares) | shares	748,904
Balance, weighted average exercise price (in dollars per share) | $ / shares	$ 17.28
Balance, weighted average remaining contractual term (Year)	4 years 284 days
Vested and exercisable (in shares) | shares	627,935
Vested and exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 18
Vested and exercisable, weighted average remaining contractual term (Year)	4 years 149 days