Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Components of Deferred Tax Assets and Liabilities [Abstract]
Property, plant and equipment	$ 5,942,048	$ 5,480,102	$ 4,546,941
Total deferred income tax liabilities	5,942,048	5,480,102	4,546,941
Other postretirement benefits	(885,729)	(653,238)	(515,133)
Inventories	(761,613)	(1,005,134)	(747,397)
Allowance for doubtful accounts	(104,903)	(94,120)	(126,593)
Intangible assets	(422,443)	(472,243)	(429,749)
Accrued compensation	(197,582)	(224,155)	(258,631)
Pensions	(7,128,057)	(5,573,596)	(4,338,664)
Other	(116,826)	(160,876)	(184,561)
Total deferred income tax assets	(9,617,153)	(8,183,362)	(6,600,728)
Net deferred income tax assets	(3,675,105)	(2,703,260)	(2,053,787)
Income before income taxes [Abstract]
Domestic	8,614,664	5,180,467	6,173,597
Foreign	4,609,854	3,326,462	2,074,821
Income before income taxes	13,224,518	8,506,929	8,248,418
Current:
Federal	1,909,172	214,988	1,543,735
Foreign	1,367,025	830,028	403,115
State	220,820	109,711	232,390
Deferred:
Federal	1,022,660	1,747,620	497,815
Foreign	0	0	0
State	79,041	99,652	28,358
Provision for income taxes	4,598,718	3,001,999	2,705,413
Reconciliation of income taxes computed using U.S. federal statutory rate to that reflected in operations [Abstract]
Income taxes using U.S. federal statutory rate	4,496,336	2,892,356	2,804,462
State income taxes, net of federal benefit	188,490	133,201	153,535
Impact of foreign subsidiaries on effective tax rate	136,590	21,329	38,813
Impact of manufacturers deduction on effective tax rate	(232,928)	(50,537)	(176,847)
Other-net	10,230	5,650	(114,550)
Provision for income taxes	4,598,718	3,001,999	2,705,413
Income taxes using U.S. federal statutory rate (in hundredths)	34.00%	34.00%	34.00%
State income taxes, net of federal benefit (in hundredths)	2.00%	2.00%	2.00%
Impact of foreign subsidiaries on effective tax rate (in hundredths)	1.00%	0.00%	1.00%
Impact of manufacturers deduction on effective tax rate (in hundredths)	(2.00%)	(1.00%)	(2.00%)
Other-net (in hundredths)	0.00%	0.00%	(2.00%)
Effective income tax rate (in hundredths)	35.00%	35.00%	33.00%
Total income taxes paid	3,350,283	1,631,299	2,466,998
Undistributed earnings of foreign subsidiaries	13,588,931
Tax benefit from exercise of non-qualified stock options and disqualifying dispositions of incentive stock options	0	106,471	107,662
Reconciliation of the beginning and ending amount of unrecognized tax benefits [Roll Forward]
Balance at beginning of year	486,332	495,843	791,540
Increases for positions taken during the current period	119,893	25,398	30,876
Decreases relating to settlements	0	0	(56,360)
Decreases resulting from the expiration of the statute of limitations	(106,601)	(34,909)	(270,213)
Balance at end of year	499,624	486,332	495,843
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would affect the annual effective tax rate	155,607
Accrued interest related to unrecognized tax benefits	$ 108,000
U.S. federal [Member]
Income Tax Contingency [Line Items]
Open tax year	2009
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Open tax year	2009
Foreign Jurisdiction [Member]
Income Tax Contingency [Line Items]
Open tax year	2006