Note 13 - Stockholders' Equity (Details) - Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Aug. 25, 2013		Aug. 26, 2012
Common Stock Shares
Balance, Common Stock Shares (in Shares)	26,402,247	[1]
Stock options exercised, net of shares tendered (in Shares)	36,836
Vested restricted stock units, net of shares tendered (in Shares)	39,726
Balance, Common Stock Shares (in Shares)	26,478,809
Common Stock
Balance, Common Stock Value	$ 26	[1]
Balance, Common Stock Value	26
Additional Paid-in Capital
Balance, Additional Paid-in Capital	126,258	[1]
Stock options exercised, net of shares tendered	250
Taxes incurred by Company for RSUs vested	(284)
Stock-based compensation expense	278
Balance, Additional Paid-in Capital	126,502
Retained Earnings
Balance, Retained Earnings	52,409	[1]
Net income	4,752		4,366
Balance, Retained Earnings	57,161
Non controlling Interest
Balance, Non Controlling Interest	1,721	[1]
Non controlling interest in net income	59		97
Balance, Non Controlling Interest	$ 1,780

[1] Derived from audited financial statements.