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ACCOUNTING POLICIES (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 02, 2016 USD ($) shares | Oct. 03, 2015 shares | Jul. 04, 2015 shares | Apr. 04, 2015 USD ($) shares | Jan. 03, 2015 USD ($) shares | Sep. 27, 2014 shares | Jun. 28, 2014 shares | Mar. 29, 2014 USD ($) shares | Jan. 02, 2016 USD ($) Customer shares | Jan. 03, 2015 USD ($) Customer shares | Dec. 28, 2013 USD ($) shares
Cash Equivalents and Concentrations of Credit Risk [Abstract] |  |  |  |  |  |  |  |  |  |  |
Amount of deposits insured by Federal Deposit Insurance Corporation (FDIC) | $ 250,000 |  |  |  |  |  |  |  | $ 250,000 |  |
Inventories [Abstract] |  |  |  |  |  |  |  |  |  |  |
LIFO inventory amount | 31,601,408 |  |  |  |  |  |  |  | 31,601,408 |  |
FIFO inventory amount | 5,241,005 |  |  |  |  |  |  |  | 5,241,005 |  |
Excess of current cost over LIFO carrying value | 6,297,368 |  |  |  | $ 6,886,000 |  |  |  | 6,297,368 | $ 6,886,000 |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  | 3,460,516 | 3,237,426 | $ 3,592,263
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  |  |  | 460,922 | 248,876 | 233,023
Amortization expense fiscal year maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
2016 | 437,000 |  |  |  |  |  |  |  | 437,000 |  |
2017 | 437,000 |  |  |  |  |  |  |  | 437,000 |  |
2018 | 437,000 |  |  |  |  |  |  |  | 437,000 |  |
2019 | 379,000 |  |  |  |  |  |  |  | 379,000 |  |
2020 | 146,000 |  |  |  |  |  |  |  | 146,000 |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 4,400,109 |  |  |  | 4,683,640 |  |  |  | 4,400,109 | 4,683,640 |
Accumulated Amortization | 2,286,533 |  |  |  | 2,185,070 |  |  |  | 2,286,533 | 2,185,070 |
Net per Balance Sheet | 2,113,576 |  |  |  | 2,498,570 |  |  |  | $ 2,113,576 | $ 2,498,570 |
Weighted-Average Amortization Period |  |  |  |  |  |  |  |  | 12 years 7 months 6 days | 12 years 8 months 12 days |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 14,960,354 |  |  |  | $ 13,842,047 | $ 14,960,354 | $ 13,842,047 |
Acquisition of Argo Transdata |  |  |  |  |  |  |  |  |  | 1,225,226 |
Foreign exchange |  |  |  |  |  |  |  |  | (169,561) | (106,919) |
Ending balance | $ 14,790,793 |  |  |  | $ 14,960,354 |  |  |  | 14,790,793 | 14,960,354 | 13,842,047
Product Development Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product development costs |  |  |  |  |  |  |  |  | 1,218,948 | 1,079,557 | 991,286
Advertising Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Advertising costs |  |  |  |  |  |  |  |  | $ 496,066 | $ 494,267 | $ 486,027
Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding (in shares) | shares | 6,246,571 | 6,245,099 | 6,244,051 | 6,244,088 | 6,231,729 | 6,223,140 | 6,222,676 | 6,222,213 | 6,245,057 | 6,225,068 | 6,220,928
Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding (in shares) | shares | 6,246,571 | 6,245,099 | 6,244,051 | 6,244,088 | 6,231,729 | 6,223,140 | 6,222,676 | 6,222,213 | 6,245,057 | 6,225,068 | 6,220,928
Dilutive stock options (in shares) | shares |  |  |  |  |  |  |  |  | 0 | 12,846 | 16,830
Denominator for diluted earnings per share (in shares) | shares | 6,246,571 | 6,245,099 | 6,244,051 | 6,244,088 | 6,231,729 | 6,240,396 | 6,239,866 | 6,239,149 | 6,245,057 | 6,237,914 | 6,237,758
Anti-dilutive stock options (in shares) | shares |  |  |  |  |  |  |  |  | 0 | 0 | 0
Industrial Hardware Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | $ 2,206,852 |  |  |  | $ 2,494,261 |  |  |  | $ 2,206,852 | $ 2,494,261 |
Accumulated Amortization | 1,478,692 |  |  |  | 1,649,655 |  |  |  | 1,478,692 | 1,649,655 |
Net per Balance Sheet | 728,160 |  |  |  | 844,606 |  |  |  | 728,160 | 844,606 |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 1,901,312 |  |  |  | $ 2,008,231 | 1,901,312 | 2,008,231 |
Acquisition of Argo Transdata |  |  |  |  |  |  |  |  |  | 0 |
Foreign exchange |  |  |  |  |  |  |  |  | (169,561) | (106,919) |
Ending balance | 1,731,751 |  |  |  | 1,901,312 |  |  |  | 1,731,751 | 1,901,312 | $ 2,008,231
Security Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 2,193,257 |  |  |  | 2,189,379 |  |  |  | 2,193,257 | 2,189,379 |
Accumulated Amortization | 807,841 |  |  |  | 535,415 |  |  |  | 807,841 | 535,415 |
Net per Balance Sheet | 1,385,416 |  |  |  | 1,653,964 |  |  |  | 1,385,416 | 1,653,964 |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 13,059,042 |  |  |  | 11,833,816 | 13,059,042 | 11,833,816 |
Acquisition of Argo Transdata |  |  |  |  |  |  |  |  |  | 1,225,226 |
Foreign exchange |  |  |  |  |  |  |  |  | 0 | 0 |
Ending balance | 13,059,042 |  |  |  | 13,059,042 |  |  |  | 13,059,042 | 13,059,042 | 11,833,816
Metal Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Accumulated Amortization | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Net per Balance Sheet | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 0 |  |  |  | $ 0 | 0 | 0 |
Acquisition of Argo Transdata |  |  |  |  |  |  |  |  |  | 0 |
Foreign exchange |  |  |  |  |  |  |  |  | 0 | 0 |
Ending balance | 0 |  |  |  | 0 |  |  |  | $ 0 | 0 | $ 0
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 |  |
Technology and Licenses [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful lives of intangible assets |  |  |  |  |  |  |  |  | 5 years |  |
Technology and Licenses [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Useful lives of intangible assets |  |  |  |  |  |  |  |  | 17 years |  |
Patents and Developed Technology [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 3,236,033 |  |  |  | 3,519,564 |  |  |  | $ 3,236,033 | 3,519,564 |
Accumulated Amortization | 2,053,718 |  |  |  | 2,185,070 |  |  |  | $ 2,053,718 | $ 2,185,070 |
Weighted-Average Amortization Period |  |  |  |  |  |  |  |  | 15 years 10 months 24 days | 15 years 8 months 12 days |
Patents and Developed Technology [Member] | Industrial Hardware Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 2,206,852 |  |  |  | 2,494,261 |  |  |  | $ 2,206,852 | $ 2,494,261 |
Accumulated Amortization | 1,478,692 |  |  |  | 1,649,655 |  |  |  | 1,478,692 | 1,649,655 |
Patents and Developed Technology [Member] | Security Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 1,029,181 |  |  |  | 1,025,303 |  |  |  | 1,029,181 | 1,025,303 |
Accumulated Amortization | 575,026 |  |  |  | 535,415 |  |  |  | 575,026 | 535,415 |
Patents and Developed Technology [Member] | Metal Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Accumulated Amortization | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 449,706 |  |  |  | 449,706 |  |  |  | 449,706 | 449,706 |
Accumulated Amortization | 89,941 |  |  |  | 0 |  |  |  | $ 89,941 | $ 0 |
Weighted-Average Amortization Period |  |  |  |  |  |  |  |  | 5 years | 5 years |
Customer Relationships [Member] | Industrial Hardware Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 0 |  |  |  | 0 |  |  |  | $ 0 | $ 0 |
Accumulated Amortization | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Customer Relationships [Member] | Security Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 449,706 |  |  |  | 449,706 |  |  |  | 449,706 | 449,706 |
Accumulated Amortization | 89,941 |  |  |  | 0 |  |  |  | 89,941 | 0 |
Customer Relationships [Member] | Metal Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Accumulated Amortization | 0 |  |  |  | 0 |  |  |  | $ 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 | 407,000 |  |  |  | 407,000 |  |  |  | $ 407,000 | 407,000 |
Accumulated Amortization | 81,400 |  |  |  | 0 |  |  |  | $ 81,400 | $ 0 |
Weighted-Average Amortization Period |  |  |  |  |  |  |  |  | 5 years | 5 years |
Non-Compete Agreements [Member] | Industrial Hardware Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 0 |  |  |  | 0 |  |  |  | $ 0 | $ 0 |
Accumulated Amortization | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Non-Compete Agreements [Member] | Security Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 407,000 |  |  |  | 407,000 |  |  |  | 407,000 | 407,000 |
Accumulated Amortization | 81,400 |  |  |  | 0 |  |  |  | 81,400 | 0 |
Non-Compete Agreements [Member] | Metal Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Accumulated Amortization | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Intellectual Property [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 307,370 |  |  |  | 307,370 |  |  |  | 307,370 | 307,370 |
Accumulated Amortization | 61,474 |  |  |  | 0 |  |  |  | $ 61,474 | $ 0 |
Weighted-Average Amortization Period |  |  |  |  |  |  |  |  | 5 years | 5 years |
Intellectual Property [Member] | Industrial Hardware Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 0 |  |  |  | 0 |  |  |  | $ 0 | $ 0 |
Accumulated Amortization | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Intellectual Property [Member] | Security Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 307,370 |  |  |  | 307,370 |  |  |  | 307,370 | 307,370 |
Accumulated Amortization | 61,474 |  |  |  | 0 |  |  |  | 61,474 | 0 |
Intellectual Property [Member] | Metal Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Accumulated Amortization | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |
Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of major customers | Customer |  |  |  |  |  |  |  |  | 0 | 0 |
Threshold percentage of concentration risk |  |  |  |  |  |  |  |  | 10.00% | 10.00% |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) | shares |  |  |  |  |  |  |  |  | 0 | 0 | 0

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