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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. 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) |  |  |
Net income |  |  | 8,625,800 |  | 8,625,800
Cash dividends declared |  |  | (3,108,577) |  | (3,108,577)
Currency translation adjustment |  |  |  | 533,291 | 533,291
Change in pension and postretirement benefit costs, net of tax |  |  |  | (3,712,466) | (3,712,466)
Issuance of Common Stock upon the exercise of stock options | 61,110 |  |  |  | 61,110
Issuance of Common Stock upon the exercise of stock options (in shares) | 4,500 |  |  |  |
Miscellaneous |  |  | 4 |  | 4
Tax benefit from exercise of non-qualified stock options and disqualifying dispositions of incentive stock options |  |  |  |  | 0
Issuance of Common Stock for directors' fees | 24,609 |  |  |  | 24,609
Issuance of Common Stock for directors' fees (in shares) | 1,371 |  |  |  |
Balances at Dec. 29, 2012 | $ 28,585,498 | $ (19,105,723) | $ 78,717,589 | $ (16,615,265) | $ 71,582,099
Balances (in shares) at Dec. 29, 2012 | 8,914,478 | (2,694,729) |  |  |

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