Note 8 - Stockholders' Equity (Details Textual) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Feb. 25, 2018	Feb. 25, 2018	May 28, 2017	Jul. 14, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	498,000
Common Stock, Capital Shares Reserved for Future Issuance	3,100,000	3,100,000
Stock Repurchase Program, Authorized Amount				$ 10
Treasury Stock, Shares, Acquired		0	0
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	0	200,000