Note 5 - Income Taxes (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Nov. 27, 2016	Nov. 29, 2015	Nov. 27, 2016	Nov. 29, 2015	May 29, 2016
Income Tax Expense (Benefit)	$ 693,000	$ 1,069,000	$ 2,582,000	$ 2,760,000
Effective Income Tax Rate Reconciliation, Percent	34.00%		36.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%		35.00%
Unrecognized Tax Benefits	$ 904,000		$ 904,000		$ 842,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	764,000		764,000		$ 715,000
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 300,000		300,000
Excess Tax Deficiencies from Share-based Compensation			$ 59,000
Domestic Tax Authority [Member] | Earliest Tax Year [Member]
Open Tax Year			1997
State and Local Jurisdiction [Member] | Earliest Tax Year [Member]
Open Tax Year			1998