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Accounting Policies (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
Cash Equivalents and Concentrations of Credit Risk [Abstract] |  |  |  |  |  |  |  |  |  |  |
Amount of deposits insured by Federal Deposit Insurance Corporation (FDIC) | $ 250,000 |  |  |  |  |  |  |  | $ 250,000 |  |
Inventory [Abstract] |  |  |  |  |  |  |  |  |  |  |
LIFO inventory amount | 21,580,351 |  |  |  |  |  |  |  | 21,580,351 |  |
FIFO inventory amount | 7,804,429 |  |  |  |  |  |  |  | 7,804,429 |  |
Excess of current cost over LIFO carrying value | 6,302,000 |  |  |  | 6,281,000 |  |  |  | 6,302,000 | 6,281,000 |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  | 3,210,324 | 3,155,717 | 3,265,832
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  |  |  | 229,476 | 551,499 | 676,807
Amortization expense fiscal year maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
2013 | 215,000 |  |  |  |  |  |  |  | 215,000 |  |
2014 | 215,000 |  |  |  |  |  |  |  | 215,000 |  |
2015 | 215,000 |  |  |  |  |  |  |  | 215,000 |  |
2016 | 215,000 |  |  |  |  |  |  |  | 215,000 |  |
2017 | 215,000 |  |  |  |  |  |  |  | 215,000 |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 3,759,555 |  |  |  | 5,871,762 |  |  |  | 3,759,555 | 5,871,762 |
Accumulated Amortization | 2,105,598 |  |  |  | 4,101,754 |  |  |  | 2,105,598 | 4,101,754 |
Net per Balance Sheet | 1,653,957 |  |  |  | 1,770,008 |  |  |  | 1,653,957 | 1,770,008 |
Weighted-Average Amortization Period |  |  |  |  |  |  |  |  | 15 years 9 months 18 days | 11 years 8 months 12 days |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 13,905,209 |  |  |  | 13,933,990 | 13,905,209 | 13,933,990 |
Foreign exchange |  |  |  |  |  |  |  |  | 28,390 | (28,781) |
Ending balance | 13,933,599 |  |  |  | 13,905,209 |  |  |  | 13,933,599 | 13,905,209 | 13,933,990
Product development costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product development costs |  |  |  |  |  |  |  |  | 814,096 | 825,778 | 739,251
Advertising costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Advertising costs |  |  |  |  |  |  |  |  | 442,300 | 386,908 | 446,899
Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding (in shares) | 6,219,384 | 6,219,241 | 6,217,198 | 6,213,913 | 6,212,875 | 6,172,193 | 6,166,883 | 6,162,711 | 6,216,931 | 6,178,664 | 6,104,711
Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding (in shares) | 6,219,384 | 6,219,241 | 6,217,198 | 6,213,913 | 6,212,875 | 6,172,193 | 6,166,883 | 6,162,711 | 6,216,931 | 6,178,664 | 6,104,711
Dilutive stock options (in shares) |  |  |  |  |  |  |  |  | 16,444 | 37,529 | 87,308
Denominator for diluted earnings per share (in shares) | 6,237,709 | 6,234,727 | 6,231,335 | 6,231,739 | 6,230,722 | 6,202,496 | 6,218,492 | 6,213,069 | 6,233,375 | 6,216,193 | 6,192,019
Anti-dilutive stock options (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Industrial Hardware Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 2,732,307 |  |  |  | 2,790,725 |  |  |  | 2,732,307 | 2,790,725 |
Accumulated Amortization | 1,652,199 |  |  |  | 1,588,667 |  |  |  | 1,652,199 | 1,588,667 |
Net per Balance Sheet | 1,080,108 |  |  |  | 1,202,058 |  |  |  | 1,080,108 | 1,202,058 |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 2,071,393 |  |  |  | 2,100,174 | 2,071,393 | 2,100,174 |
Foreign exchange |  |  |  |  |  |  |  |  | 28,390 | (28,781) |
Ending balance | 2,099,783 |  |  |  | 2,071,393 |  |  |  | 2,099,783 | 2,071,393 |
Security Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 1,021,409 |  |  |  | 3,075,198 |  |  |  | 1,021,409 | 3,075,198 |
Accumulated Amortization | 447,732 |  |  |  | 2,507,764 |  |  |  | 447,732 | 2,507,764 |
Net per Balance Sheet | 573,677 |  |  |  | 567,434 |  |  |  | 573,677 | 567,434 |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 11,833,816 |  |  |  | 11,833,816 | 11,833,816 | 11,833,816 |
Foreign exchange |  |  |  |  |  |  |  |  | 0 | 0 |
Ending balance | 11,833,816 |  |  |  | 11,833,816 |  |  |  | 11,833,816 | 11,833,816 |
Metal Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 5,839 |  |  |  | 5,839 |  |  |  | 5,839 | 5,839 |
Accumulated Amortization | 5,667 |  |  |  | 5,323 |  |  |  | 5,667 | 5,323 |
Net per Balance Sheet | 172 |  |  |  | 516 |  |  |  | 172 | 516 |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 0 |  |  |  | 0 | 0 | 0 |
Foreign exchange |  |  |  |  |  |  |  |  | 0 | 0 |
Ending balance | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Patents and Developed Technology [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount |  |  |  |  | 3,783,391 |  |  |  |  | 3,783,391 |
Accumulated Amortization |  |  |  |  | 2,028,548 |  |  |  |  | 2,028,548 |
Weighted-Average Amortization Period |  |  |  |  |  |  |  |  |  | 15 years 6 months |
Patents and Developed Technology [Member] | Industrial Hardware Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount |  |  |  |  | 2,714,900 |  |  |  |  | 2,714,900 |
Accumulated Amortization |  |  |  |  | 1,528,007 |  |  |  |  | 1,528,007 |
Patents and Developed Technology [Member] | Security Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount |  |  |  |  | 1,062,652 |  |  |  |  | 1,062,652 |
Accumulated Amortization |  |  |  |  | 495,218 |  |  |  |  | 495,218 |
Patents and Developed Technology [Member] | Metal Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount |  |  |  |  | 5,839 |  |  |  |  | 5,839 |
Accumulated Amortization |  |  |  |  | 5,323 |  |  |  |  | 5,323 |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount |  |  |  |  | 1,967,636 |  |  |  |  | 1,967,636 |
Accumulated Amortization |  |  |  |  | 1,958,471 |  |  |  |  | 1,958,471 |
Weighted-Average Amortization Period |  |  |  |  |  |  |  |  |  | 5 years |
Customer Relationships [Member] | Industrial Hardware Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount |  |  |  |  | 45,825 |  |  |  |  | 45,825 |
Accumulated Amortization |  |  |  |  | 36,660 |  |  |  |  | 36,660 |
Customer Relationships [Member] | Security Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount |  |  |  |  | 1,921,811 |  |  |  |  | 1,921,811 |
Accumulated Amortization |  |  |  |  | 1,921,811 |  |  |  |  | 1,921,811 |
Customer Relationships [Member] | Metal Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount |  |  |  |  | 0 |  |  |  |  | 0 |
Accumulated Amortization |  |  |  |  | 0 |  |  |  |  | 0 |
Non-Compete Agreements [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful lives of intangible assets |  |  |  |  |  |  |  |  | 5 years |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount |  |  |  |  | 120,735 |  |  |  |  | 120,735 |
Accumulated Amortization |  |  |  |  | 114,735 |  |  |  |  | 114,735 |
Weighted-Average Amortization Period |  |  |  |  |  |  |  |  |  | 5 years |
Non-Compete Agreements [Member] | Industrial Hardware Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount |  |  |  |  | 30,000 |  |  |  |  | 30,000 |
Accumulated Amortization |  |  |  |  | 24,000 |  |  |  |  | 24,000 |
Non-Compete Agreements [Member] | Security Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount |  |  |  |  | 90,735 |  |  |  |  | 90,735 |
Accumulated Amortization |  |  |  |  | 90,735 |  |  |  |  | 90,735 |
Non-Compete Agreements [Member] | Metal Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount |  |  |  |  | 0 |  |  |  |  | 0 |
Accumulated Amortization |  |  |  |  | $ 0 |  |  |  |  | $ 0 |
Minimum [Member] | Technology and Licenses [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful lives of intangible assets |  |  |  |  |  |  |  |  | 5 years |  |
Maximum [Member] | Technology and Licenses [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful lives of intangible assets |  |  |  |  |  |  |  |  | 17 years |  |
Building [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of the assets |  |  |  |  |  |  |  |  | 10 years |  |
Building [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of the assets |  |  |  |  |  |  |  |  | 39 years 6 months |  |
Machinery and Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of the assets |  |  |  |  |  |  |  |  | 3 years |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives of the assets |  |  |  |  |  |  |  |  | 10 years |  |
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% |

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