Consolidated Statements of Shareholders' Equity (USD $)	Common Stock [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balances at Jan. 03, 2009	$ 24,418,916	$ (17,578,088)	$ 68,676,943	$ (13,036,206)	$ 62,481,565
Balances (in shares) at Jan. 03, 2009	8,553,353	(2,588,334)
Net income			1,036,407		1,036,407
Cash dividends declared			(2,155,149)		(2,155,149)
Currency translation adjustment				1,031,023	1,031,023
Change in pension and postretirement benefit costs, net of tax				2,426,568	2,426,568
Change in derivative financial instrument, net of tax				130,298	130,298
Termination of derivative financial instrument, net of tax				626,359	626,359
Purchase of Common Stock for treasury		(797,328)			(797,328)
Purchase of Common Stock for treasury (in shares)		(55,881)
Issuance of Common Stock upon the exercise of stock options	1,584,042				1,584,042
Issuance of Common Stock upon the exercise of stock options (in shares)	153,421
Tax benefit from exercise of non-qualified stock options and disqualifying dispositions of incentive stock options	202,767				202,767
Issuance of Common Stock for directors' fees	30,752				30,752
Issuance of Common Stock for directors' fees (in shares)	2,610
Balances at Jan. 02, 2010	26,236,477	(18,375,416)	67,558,201	(8,821,958)	66,597,304
Balances (in shares) at Jan. 02, 2010	8,709,384	(2,644,215)
Net income			5,543,005		5,543,005
Cash dividends declared			(3,181,587)		(3,181,587)
Currency translation adjustment				752,662	752,662
Change in pension and postretirement benefit costs, net of tax				(418,175)	(418,175)
Purchase of Common Stock for treasury		(730,307)			(730,307)
Purchase of Common Stock for treasury (in shares)		(50,514)
Issuance of Common Stock upon the exercise of stock options	1,348,585				1,348,585
Issuance of Common Stock upon the exercise of stock options (in shares)	141,750
Tax benefit from exercise of non-qualified stock options and disqualifying dispositions of incentive stock options	107,662				107,662
Issuance of Common Stock for directors' fees	24,594				24,594
Issuance of Common Stock for directors' fees (in shares)	1,628
Balances at Jan. 01, 2011	27,717,318	(19,105,723)	69,919,619	(8,487,471)	70,043,743
Balances (in shares) at Jan. 01, 2011	8,852,762	(2,694,729)
Net income			5,504,930		5,504,930
Cash dividends declared			(2,224,187)		(2,224,187)
Currency translation adjustment				(341,488)	(341,488)
Change in pension and postretirement benefit costs, net of tax				(4,607,131)	(4,607,131)
Issuance of Common Stock upon the exercise of stock options	651,390				651,390
Issuance of Common Stock upon the exercise of stock options (in shares)	54,500
Tax benefit from exercise of non-qualified stock options and disqualifying dispositions of incentive stock options	106,471				106,471
Issuance of Common Stock for directors' fees	24,600				24,600
Issuance of Common Stock for directors' fees (in shares)	1,345
Balances at Dec. 31, 2011	$ 28,499,779	$ (19,105,723)	$ 73,200,362	$ (13,436,090)	$ 69,158,328
Balances (in shares) at Dec. 31, 2011	8,908,607	(2,694,729)