Note 7 - Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	May 29, 2016	May 31, 2015	May 25, 2014
Unrecognized tax benefits – beginning of the period	$ 987,000	$ 1,035,000	$ 998,000
Gross increases – tax positions in prior period	1,000	17,000	7,000
Gross decreases – tax positions in prior period	(223,000)	(141,000)	(48,000)
Gross increases – current-period tax positions	77,000	76,000	78,000
Unrecognized tax benefits – end of the period	$ 842,000	$ 987,000	$ 1,035,000