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ACCOUNTING POLICIES (Details) | 3 Months Ended | 12 Months Ended
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Dec. 30, 2017 USD ($) shares | Sep. 30, 2017 USD ($) shares | Jul. 01, 2017 USD ($) shares | Apr. 01, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Oct. 01, 2016 USD ($) shares | Jul. 02, 2016 USD ($) shares | Apr. 02, 2016 USD ($) shares | Dec. 30, 2017 USD ($) Customer shares | Dec. 31, 2016 USD ($) Customer shares | Jan. 02, 2016 USD ($) Customer shares
Cash Equivalents and Concentrations of Credit Risk [Abstract] |  |  |  |  |  |  |  |  |  |  |
Amount of deposits insured by Federal Deposit Insurance Corporation (FDIC) | $ 250,000 |  |  |  |  |  |  |  | $ 250,000 |  |
Percentage of available cash located in foreign subsidiaries |  |  |  |  |  |  |  |  | 64.00% |  |
Inventories [Abstract] |  |  |  |  |  |  |  |  |  |  |
LIFO inventory amount | 26,280,620 |  |  |  |  |  |  |  | $ 26,280,620 |  |
FIFO inventory amount | 8,034,924 |  |  |  |  |  |  |  | 8,034,924 |  |
Excess of current cost over LIFO carrying value | 6,476,073 |  |  |  | $ 6,121,286 |  |  |  | 6,476,073 | $ 6,121,286 |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  | 3,948,728 | 3,371,694 | $ 3,460,516
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  |  |  | 770,457 | 442,699 | 460,922
Amortization expense fiscal year maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
2018 | 1,228,000 |  |  |  |  |  |  |  | 1,228,000 |  |
2019 | 1,228,000 |  |  |  |  |  |  |  | 1,228,000 |  |
2020 | 995,000 |  |  |  |  |  |  |  | 995,000 |  |
2021 | 995,000 |  |  |  |  |  |  |  | 995,000 |  |
2022 | 853,000 |  |  |  |  |  |  |  | 853,000 |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 12,910,450 |  |  |  | 4,358,510 |  |  |  | 12,910,450 | 4,358,510 |
Accumulated Amortization | 3,635,292 |  |  |  | 2,594,061 |  |  |  | 3,635,292 | 2,594,061 |
Net per Balance Sheet | 9,275,158 |  |  |  | 1,764,449 |  |  |  | $ 9,275,158 | $ 1,764,449 |
Weighted-Average Amortization Period |  |  |  |  |  |  |  |  | 10 years 9 months 18 days | 12 years 3 months 18 days |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 14,819,835 |  |  |  | $ 14,790,793 | $ 14,819,835 | $ 14,790,793 |
Investment - Velvac |  |  |  |  |  |  |  |  | 17,340,946 |  |
Foreign exchange |  |  |  |  |  |  |  |  | 68,110 | 29,042 |
Ending balance | 32,228,891 |  |  |  | 14,819,835 |  |  |  | 32,228,891 | 14,819,835 | 14,790,793
Engineering Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Engineering expenses | $ 1,460,670 | $ 1,848,861 | $ 1,682,887 | $ 630,411 | $ 577,056 | $ 663,704 | $ 733,009 | $ 594,538 | 5,622,829 | 2,568,307 | 2,459,062
Research & development costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Research & development costs |  |  |  |  |  |  |  |  | 3,678,481 | 1,525,650 | 1,218,948
Advertising Costs [Abstract] |  |  |  |  |  |  |  |  |  |  |
Advertising costs |  |  |  |  |  |  |  |  | $ 526,651 | $ 441,853 | $ 496,066
Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding (in shares) | shares | 6,261,737 | 6,259,872 | 6,258,467 | 6,256,496 | 6,254,605 | 6,252,681 | 6,250,610 | 6,248,222 | 6,259,139 | 6,251,535 | 6,245,057
Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding (in shares) | shares | 6,261,737 | 6,259,872 | 6,258,467 | 6,256,496 | 6,254,605 | 6,252,681 | 6,250,610 | 6,248,222 | 6,259,139 | 6,251,535 | 6,245,057
Dilutive stock options (in shares) | shares |  |  |  |  |  |  |  |  | 35,634 | 0 | 0
Denominator for diluted earnings per share (in shares) | shares | 6,297,371 | 6,296,551 | 6,285,339 | 6,256,496 | 6,254,605 | 6,252,681 | 6,250,610 | 6,248,222 | 6,294,773 | 6,251,535 | 6,245,057
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 | $ 10,724,456 |  |  |  | $ 2,159,060 |  |  |  | $ 10,724,456 | $ 2,159,060 |
Accumulated Amortization | 2,306,063 |  |  |  | 1,529,675 |  |  |  | 2,306,063 | 1,529,675 |
Net per Balance Sheet | 8,418,393 |  |  |  | 629,385 |  |  |  | 8,418,393 | 629,385 |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 1,760,793 |  |  |  | $ 1,731,751 | 1,760,793 | 1,731,751 |
Investment - Velvac |  |  |  |  |  |  |  |  | 17,340,946 |  |
Foreign exchange |  |  |  |  |  |  |  |  | 68,110 | 29,042 |
Ending balance | 19,169,849 |  |  |  | 1,760,793 |  |  |  | 19,169,849 | 1,760,793 | $ 1,731,751
Security Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 2,185,994 |  |  |  | 2,199,450 |  |  |  | 2,185,994 | 2,199,450 |
Accumulated Amortization | 1,329,229 |  |  |  | 1,064,386 |  |  |  | 1,329,229 | 1,064,386 |
Net per Balance Sheet | 856,765 |  |  |  | 1,135,064 |  |  |  | 856,765 | 1,135,064 |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 13,059,042 |  |  |  | 13,059,042 | 13,059,042 | 13,059,042 |
Investment - Velvac |  |  |  |  |  |  |  |  | 0 |  |
Foreign exchange |  |  |  |  |  |  |  |  | 0 | 0 |
Ending balance | 13,059,042 |  |  |  | 13,059,042 |  |  |  | 13,059,042 | 13,059,042 | 13,059,042
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 |
Investment - Velvac |  |  |  |  |  |  |  |  | 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 | 8,096,374 |  |  |  | 3,194,434 |  |  |  | $ 8,096,374 | 3,194,434 |
Accumulated Amortization | 2,638,202 |  |  |  | 2,128,431 |  |  |  | $ 2,638,202 | $ 2,128,431 |
Weighted-Average Amortization Period |  |  |  |  |  |  |  |  | 12 years 3 months 18 days | 15 years 7 months 6 days |
Patents and Developed Technology [Member] | Industrial Hardware Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 7,074,456 |  |  |  | 2,159,060 |  |  |  | $ 7,074,456 | $ 2,159,060 |
Accumulated Amortization | 2,007,418 |  |  |  | 1,529,675 |  |  |  | 2,007,418 | 1,529,675 |
Patents and Developed Technology [Member] | Security Products Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 1,021,918 |  |  |  | 1,035,374 |  |  |  | 1,021,918 | 1,035,374 |
Accumulated Amortization | 630,784 |  |  |  | 598,756 |  |  |  | 630,784 | 598,756 |
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] |  |  |  |  |  |  |  |  |  |  |
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 | 4,099,706 |  |  |  | 449,706 |  |  |  | $ 4,099,706 | 449,706 |
Accumulated Amortization | 568,468 |  |  |  | 179,882 |  |  |  | $ 568,468 | $ 179,882 |
Weighted-Average Amortization Period |  |  |  |  |  |  |  |  | 9 years 6 months | 5 years |
Customer Relationships [Member] | Industrial Hardware Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gross Amount | 3,650,000 |  |  |  | 0 |  |  |  | $ 3,650,000 | $ 0 |
Accumulated Amortization | 298,645 |  |  |  | 0 |  |  |  | 298,645 | 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 | 269,823 |  |  |  | 179,882 |  |  |  | 269,823 | 179,882 |
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 | 244,200 |  |  |  | 162,800 |  |  |  | $ 244,200 | $ 162,800 |
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 | 244,200 |  |  |  | 162,800 |  |  |  | 244,200 | 162,800 |
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 | 184,422 |  |  |  | 122,948 |  |  |  | $ 184,422 | $ 122,948 |
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 | 184,422 |  |  |  | 122,948 |  |  |  | 184,422 | 122,948 |
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 |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of major customers | Customer |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  | 25,000 | 0 | 0
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) | shares |  |  |  |  |  |  |  |  | 149,500 | 0 |
Stock Options and SARs [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted (in shares) | shares |  |  |  |  |  |  |  |  | 174,500 |  |

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