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