Consolidated Statement Of Shareholders' Equity (USD $) | Common Stock At $1 Per Share - Shares And Amount [Member] | Additional Contributed Capital [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Retained Earnings [Member] | Treasury Shares [Member] | Total |
|---|---|---|---|---|---|---|
| Balance at Jun. 01, 2010 | $ 7,585,764 | $ 65,222,878 | $ (7,856,427) | $ 89,701,652 | $ (34,559,851) | $ 120,094,016 |
| Net (loss) earnings | 2,741,279 | 2,741,279 | ||||
| Other comprehensive income (loss), net of tax | 245,084 | 245,084 | ||||
| Stock options exercised | 1,000 | (182,490) | 855,444 | 673,954 | ||
| Excess tax benefit from stock options exercised | 208,223 | 208,223 | ||||
| Stock-based compensation expense | 94,728 | 94,728 | ||||
| Treasury shares acquired | (1,118,171) | (1,118,171) | ||||
| Other treasury shares re-issued | 16,308 | 34,238 | 50,546 | |||
| Cash dividends, per share | (1,417,914) | (1,417,914) | ||||
| Balance at Sep. 21, 2010 | 7,586,764 | 65,359,647 | (7,611,343) | 91,025,017 | (34,788,340) | 121,571,745 |
| Net (loss) earnings | 6,731,310 | 6,731,310 | ||||
| Other comprehensive income (loss), net of tax | 1,884,788 | 1,884,788 | ||||
| Stock options exercised | (3,943) | 66,621 | 62,678 | |||
| Issuance of restricted stock | (166,338) | 166,338 | ||||
| Excess tax benefit from stock options exercised | 15,073 | 15,073 | ||||
| Stock-based compensation expense | 326,194 | 326,194 | ||||
| Treasury shares acquired | (3,562,053) | (3,562,053) | ||||
| Employee stock purchase plan | 5,001 | 5,001 | ||||
| Cash dividends, per share | (1,506,844) | (1,506,844) | ||||
| Balance at May. 31, 2011 | 7,586,764 | 65,535,634 | (5,726,555) | 96,249,483 | (38,117,434) | 125,527,892 |
| Net (loss) earnings | (2,274,283) | (2,274,283) | ||||
| Other comprehensive income (loss), net of tax | 208,323 | 208,323 | ||||
| Stock options exercised | 15,080 | 71,770 | 86,850 | |||
| Issuance of restricted stock | (102,045) | 102,045 | ||||
| Excess tax benefit from stock options exercised | 3,800 | 3,800 | ||||
| Stock-based compensation expense | 301,751 | 248,132 | 549,883 | |||
| Treasury shares acquired | (588,206) | (588,206) | ||||
| Other treasury shares re-issued | 8,886 | 21,247 | 30,133 | |||
| Cash dividends, per share | (1,528,150) | (1,528,150) | ||||
| Balance at Sep. 20, 2011 | $ 7,586,764 | $ 65,763,106 | $ (5,518,232) | $ 92,447,050 | $ (38,262,446) | $ 122,016,242 |