Note 12 - Contingencies (Details Textual)	12 Months Ended
	Feb. 25, 2018 USD ($)	Feb. 26, 2017 USD ($)	Feb. 28, 2016 USD ($)
Number of Sites of Company or Subsidiaries That Have Been Named for Potential Environmental Remediation Liability	4
Percentage of Legal Defense and Remediation Costs Associated with Sites Reimbursed by Insurance Carriers	100.00%
Number of Units Covered Under General Liability Insurance Coverage	3
Litigation Settlement, Expense	$ 7,000	$ 0	$ 2,000
Accrual for Environmental Loss Contingencies, Ending Balance	$ 0	$ 0	$ 0
Number of Insurance Carriers			3