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Reportable Segments (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2012 | Sep. 29, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Oct. 01, 2011 | Jul. 02, 2011 | Apr. 02, 2011 | Dec. 29, 2012 | Dec. 31, 2011 | Jan. 01, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales to unaffiliated customers | $ 35,809,652 | $ 39,644,050 | $ 41,559,589 | $ 40,495,894 | $ 38,057,309 | $ 36,089,946 | $ 35,520,182 | $ 33,188,612 | $ 157,509,185 | $ 142,856,049 | $ 130,130,360
Inter-segment revenue |  |  |  |  |  |  |  |  | 3,185,578 | 3,208,348 | 3,520,945
Operating profit |  |  |  |  |  |  |  |  | 13,551,423 | 8,712,180 | 8,511,719
Interest expense |  |  |  |  |  |  |  |  | (369,357) | (231,481) | (266,297)
Other income |  |  |  |  |  |  |  |  | 42,452 | 26,230 | 2,996
Income before income taxes |  |  |  |  |  |  |  |  | 13,224,518 | 8,506,929 | 8,248,418
Assets | 115,854,150 |  |  |  | 106,699,974 |  |  |  | 115,854,150 | 106,699,974 | 102,353,480
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,439,800 | 3,707,216 | 3,942,639
Capital expenditures |  |  |  |  |  |  |  |  | 4,149,943 | 3,377,620 | 4,626,150
Currency translation adjustment | (2,730) |  |  |  | 7,132 |  |  |  | (2,730) | 7,132 | (20,536)
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | 35,809,652 | 39,644,050 | 41,559,589 | 40,495,894 | 38,057,309 | 36,089,946 | 35,520,182 | 33,188,612 | 157,509,185 | 142,856,049 | 130,130,360
Assets | 115,854,150 |  |  |  | 106,699,974 |  |  |  | 115,854,150 | 106,699,974 | 102,353,480
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales to unaffiliated customers |  |  |  |  |  |  |  |  | 120,604,363 | 107,472,590 | 106,141,008
Assets | 95,441,029 |  |  |  | 86,844,921 |  |  |  | 95,441,029 | 86,844,921 | 84,804,542
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 120,604,363 | 107,472,590 | 106,141,008
Assets | 95,441,029 |  |  |  | 86,844,921 |  |  |  | 95,441,029 | 86,844,921 | 84,804,542
Foreign [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales to unaffiliated customers |  |  |  |  |  |  |  |  | 36,904,822 | 35,383,459 | 23,989,352
Assets | 20,413,121 |  |  |  | 19,855,053 |  |  |  | 20,413,121 | 19,855,053 | 17,548,938
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 36,904,822 | 35,383,459 | 23,989,352
Assets | 20,413,121 |  |  |  | 19,855,053 |  |  |  | 20,413,121 | 19,855,053 | 17,548,938
Industrial Hardware [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales to unaffiliated customers |  |  |  |  |  |  |  |  | 72,268,559 | 66,119,119 | 57,527,864
Inter-segment revenue |  |  |  |  |  |  |  |  | 270,911 | 330,150 | 318,094
Operating profit |  |  |  |  |  |  |  |  | 7,566,512 | 4,912,341 | 5,148,116
Assets | 34,425,594 |  |  |  | 32,298,527 |  |  |  | 34,425,594 | 32,298,527 | 29,491,572
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,769,097 | 1,768,975 | 1,748,612
Capital expenditures |  |  |  |  |  |  |  |  | 1,552,147 | 1,568,779 | 1,589,771
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 72,268,559 | 66,119,119 | 57,527,864
Assets | 34,425,594 |  |  |  | 32,298,527 |  |  |  | 34,425,594 | 32,298,527 | 29,491,572
Security Products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales to unaffiliated customers |  |  |  |  |  |  |  |  | 50,138,121 | 47,972,152 | 45,873,391
Inter-segment revenue |  |  |  |  |  |  |  |  | 2,914,667 | 2,751,060 | 2,789,443
Operating profit |  |  |  |  |  |  |  |  | 4,113,661 | 3,408,187 | 3,378,489
Assets | 41,857,156 |  |  |  | 42,149,711 |  |  |  | 41,857,156 | 42,149,711 | 42,375,361
Depreciation and amortization |  |  |  |  |  |  |  |  | 628,652 | 984,879 | 1,297,471
Capital expenditures |  |  |  |  |  |  |  |  | 260,692 | 331,619 | 597,822
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 50,138,121 | 47,972,152 | 45,873,391
Assets | 41,857,156 |  |  |  | 42,149,711 |  |  |  | 41,857,156 | 42,149,711 | 42,375,361
Metal Products [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales to unaffiliated customers |  |  |  |  |  |  |  |  | 35,102,505 | 28,764,778 | 26,729,105
Inter-segment revenue |  |  |  |  |  |  |  |  | 0 | 127,138 | 413,408
Operating profit |  |  |  |  |  |  |  |  | 1,871,250 | 391,652 | (14,886)
Assets | 18,281,619 |  |  |  | 16,814,255 |  |  |  | 18,281,619 | 16,814,255 | 15,392,848
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,042,051 | 953,362 | 896,556
Capital expenditures |  |  |  |  |  |  |  |  | 2,337,104 | 1,477,222 | 2,438,557
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 35,102,505 | 28,764,778 | 26,729,105
Assets | 18,281,619 |  |  |  | 16,814,255 |  |  |  | 18,281,619 | 16,814,255 | 15,392,848
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets | 94,564,369 |  |  |  | 91,262,493 |  |  |  | 94,564,369 | 91,262,493 | 87,259,781
Currency translation adjustment | 4,216,970 |  |  |  | 3,394,726 |  |  |  | 4,216,970 | 3,394,726 | 4,733,244
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets | 94,564,369 |  |  |  | 91,262,493 |  |  |  | 94,564,369 | 91,262,493 | 87,259,781
General corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets | 21,289,781 |  |  |  | 15,437,481 |  |  |  | 21,289,781 | 15,437,481 | 15,093,699
Currency translation adjustment | 69,757 |  |  |  | 9,974 |  |  |  | 69,757 | 9,974 | 127,630
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets | $ 21,289,781 |  |  |  | $ 15,437,481 |  |  |  | $ 21,289,781 | $ 15,437,481 | $ 15,093,699
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of major customers |  |  |  |  |  |  |  |  | 0 | 1 |
Threshold percentage of concentration risk (in hundredths) |  |  |  |  |  |  |  |  | 10.00% | 10.00% |
Sales Revenue [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of major customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Threshold percentage of concentration risk (in hundredths) |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00%

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