Note 5 - Stock-based Compensation - Fair Value Assumptions (Details) - $ / shares	12 Months Ended
	Feb. 26, 2017	Feb. 28, 2016	Mar. 01, 2015
Weighted average fair value per share of option grants (in dollars per share)	$ 3.15	$ 5.30	$ 8.05
Risk-free interest rates	1.77%
Expected stock price volatility	28.90%
Expected dividend yields	2.23%
Estimated option terms (in years) (Year)	5 years 109 days		7 years 292 days
Minimum [Member]
Risk-free interest rates		1.57%	2.03%
Expected stock price volatility		27.91%	31.07%
Expected dividend yields		1.84%	1.34%
Estimated option terms (in years) (Year)		5 years 109 days
Maximum [Member]
Risk-free interest rates		1.86%	2.18%
Expected stock price volatility		31.71%	31.59%
Expected dividend yields		2.76%	1.77%
Estimated option terms (in years) (Year)		7 years 328 days