Stockholders Equity (Details Textual) (USD $)	3 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 27, 2012	May 31, 2012	Aug. 29, 2011
Stockholders' Equity (Textual) [Abstract]
Shares of common stock	50,000,000			50,000,000
Unamortized compensation cost of restricted stock and restricted stock unit awards	$ 651,000
Common stock Dividend Declared	$ 0.04	$ 0.03
Shares of common stock, par value	$ 0.0001			$ 0.0001
Stockholders Equity (Additional Textual) [Abstract]
Common stock, shares outstanding	25,575,540		25,575,540	25,574,124	25,574,124
Authorized capital stock for Company	51,000,000
Common stock, shares authorized	50,000,000			50,000,000
Shares of preferred stock	1,000,000
Shares of preferred stock, par value	$ 0.0001
Stock repurchased amount during period	0	143,000
Stock options vest over various terms	3 years
Expiry of stock options	10 years
Stock options exercised
Special dividend paid	1,024,000	810,000
volatilities period	2 years 6 months
Restricted Stock [Member]
Stockholders' Equity (Textual) [Abstract]
Restricted stock unit, granted	59,132	43,388
Restricted stock unit, grant date fair value per share	$ 4.60	$ 10.59
Vested shares	(1,416)
Unamortized compensation cost of restricted stock and restricted stock unit awards	251,000
Compensation expenses restricted stock award	24,000	65,000
Unamortized Compensation Cost Weighted Average Period	2 years 0 months
Restricted Stock [Member] | Board of Directors Chairman [Member]
Stockholders' Equity (Textual) [Abstract]
Vested shares	472
Stock Options [Member]
Stockholders' Equity (Textual) [Abstract]
Stock options authorized	1,300,000
Common stock remain available for stock option plan	588,182
Unamortized Compensation Cost Weighted Average Period	2 years 4 months 24 days
Compensation expense of stock options	55,000	63,000
Restricted Stock Units (RSUs) [Member]
Stockholders' Equity (Textual) [Abstract]
Restricted stock unit, granted	46,088	41,500
Restricted stock unit, grant date fair value per share	$ 4.60	$ 10.59
Unamortized compensation cost of restricted stock and restricted stock unit awards		$ 0
First quarter of fiscal two thousand thirteen [Member]
Stockholders' Equity (Textual) [Abstract]
Vested shares	1,416