Restatement Adjustments on Consolidated Balance Sheet (Detail) - USD ($)	May. 29, 2015	May. 30, 2014	May. 31, 2013
CURRENT ASSETS
Cash and cash equivalents	$ 1,159,449	$ 1,160,630	$ 757,111
Receivables:
Trade accounts	11,129,302	11,333,609
Other	26,387	77,415
Receivables, gross	11,155,689	11,411,024
Less: Allowance for doubtful accounts	70,000	70,000
Receivables, net	11,085,689	11,341,024
Inventories:
Raw materials	1,781,397	2,123,313
Finished goods	3,460,800	3,536,326
Inventories, net	5,242,197	5,659,639
Prepaid expenses	1,350,201	1,277,861
Accrued income taxes	476,154	0
Deferred income taxes	1,139,433	1,395,504
Total current assets	20,453,123	20,834,658
PROPERTY, PLANT AND EQUIPMENT
Land	2,769,499	2,769,499
Buildings	18,787,967	18,804,228
Machinery and equipment	67,543,226	66,295,760
Transportation equipment	8,268,311	7,304,711
Property, plant and equipment, gross	97,369,003	95,174,198
Less: Accumulated depreciation	72,880,525	69,502,854
Property, plant and equipment, net	24,488,478	25,671,344
OTHER ASSETS
Cash surrender value of life insurance	630,259	602,353
Other	973,195	1,207,743
Total other assets	1,603,454	1,810,096
Total Assets	46,545,055	48,316,098
CURRENT LIABILITIES
Checks outstanding in excess of bank balances	1,068,745	1,971,076
Accounts payable	4,049,333	3,719,102
Current portion of long-term debt	799,204	369,979
Line of credit outstanding	2,823,477	2,528,511
Accrued income tax		378,659
Other accrued expenses	5,021,286	5,953,171
Salary continuation plan	106,148	212,970
Total current liabilities	13,868,193	15,133,468
LONG-TERM LIABILITIES
Notes payable - bank, non-current	6,213,513	4,944,233
Salary continuation plan	921,882	920,184
Deferred income taxes	3,856,793	3,805,221
Total long-term liabilities	10,992,188	9,669,638
STOCKHOLDER'S EQUITY
Common stock - $.66-2/3 par value: Authorized 35,000,000 shares; issued 13,828,793 shares	9,219,195	9,219,195
Additional paid-in capital	6,552,973	6,497,954
Retained earnings	19,049,500	18,728,462
Treasury shares -at cost (2,537,036 shares in 2015, 2,096,161 shares in 2014)	(13,136,994)	(10,932,619)
Total stockholder's equity	21,684,674	23,512,992	$ 24,057,744
Total liabilities and stockholders' equity	$ 46,545,055	48,316,098
As Originally Reported [Member]
CURRENT ASSETS
Cash and cash equivalents		1,160,630
Receivables:
Trade accounts		11,333,609
Other		77,415
Receivables, gross		11,411,024
Less: Allowance for doubtful accounts		70,000
Receivables, net		11,341,024
Inventories:
Raw materials		2,123,313
Finished goods		3,536,326
Inventories, net		5,659,639
Prepaid expenses		1,277,861
Accrued income taxes		0
Deferred income taxes		559,672
Total current assets		19,998,826
PROPERTY, PLANT AND EQUIPMENT
Land		2,769,499
Buildings		18,804,228
Machinery and equipment		66,295,760
Transportation equipment		7,304,711
Property, plant and equipment, gross		95,174,198
Less: Accumulated depreciation		69,502,854
Property, plant and equipment, net		25,671,344
OTHER ASSETS
Cash surrender value of life insurance		602,353
Other		1,207,743
Total other assets		1,810,096
Total Assets		47,480,266
CURRENT LIABILITIES
Checks outstanding in excess of bank balances		1,971,076
Accounts payable		3,719,102
Current portion of long-term debt		369,979
Line of credit outstanding		2,528,511
Accrued income tax		378,659
Other accrued expenses		5,953,171
Salary continuation plan		212,970
Total current liabilities		15,133,468
LONG-TERM LIABILITIES
Notes payable - bank, non-current		4,944,233
Salary continuation plan		920,184
Deferred income taxes		2,969,389
Total long-term liabilities		8,833,806
STOCKHOLDER'S EQUITY
Common stock - $.66-2/3 par value: Authorized 35,000,000 shares; issued 13,828,793 shares		9,219,195
Additional paid-in capital		6,497,954
Retained earnings		18,728,462
Treasury shares -at cost (2,537,036 shares in 2015, 2,096,161 shares in 2014)		(10,932,619)
Total stockholder's equity		23,512,992
Total liabilities and stockholders' equity		$ 47,480,266