ACCOUNTING POLICIES (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 29, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Mar. 30, 2013	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Cash Equivalents and Concentrations of Credit Risk [Abstract]
Amount of deposits insured by Federal Deposit Insurance Corporation (FDIC)									$ 250,000
Inventories [Abstract]
LIFO inventory amount									28,324,813
FIFO inventory amount									6,077,384
Excess of current cost over LIFO carrying value					6,689,000				6,886,000	6,689,000
Property, Plant and Equipment [Line Items]
Depreciation									3,237,426	3,592,263	3,210,324
Finite-Lived Intangible Assets [Line Items]
Amortization expense									248,876	233,023	229,476
Amortization expense fiscal year maturity [Abstract]
2015									477,000
2016									476,000
2017									474,000
2018									474,000
2019									474,000
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount					3,637,181				4,683,640	3,637,181
Accumulated Amortization					2,179,678				2,185,070	2,179,678
Net per Balance Sheet					1,457,503				2,498,570	1,457,503
Weighted-Average Amortization Period									12 years 8 months 12 days	16 years
Goodwill [Roll Forward]
Beginning balance				13,842,047				13,933,599	13,842,047	13,933,599
Acquisition of Argo Transdata									1,225,226
Foreign exchange									(106,919)	(91,552)
Ending balance					13,842,047				14,960,354	13,842,047	13,933,599
Product Development Costs [Abstract]
Product development costs									1,079,557	991,286	814,096
Advertising Costs [Abstract]
Advertising costs									494,267	486,027	442,300
Basic [Abstract]
Weighted average shares outstanding (in shares)	6,231,729	6,223,140	6,222,676	6,222,213	6,221,851	6,221,515	6,220,569	6,219,775	6,225,068	6,220,928	6,216,931
Diluted [Abstract]
Weighted average shares outstanding (in shares)	6,231,729	6,223,140	6,222,676	6,222,213	6,221,851	6,221,515	6,220,569	6,219,775	6,225,068	6,220,928	6,216,931
Dilutive stock options (in shares)									12,846	16,830	16,444
Denominator for diluted earnings per share (in shares)	6,231,729	6,240,396	6,239,866	6,239,149	6,238,089	6,238,074	6,238,025	6,236,842	6,237,914	6,237,758	6,233,375
Anti-dilutive stock options (in shares)									0	0	0
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options granted (in shares)									0	0	0
Industrial Hardware Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount					2,595,931				2,494,261	2,595,931
Accumulated Amortization					1,676,440				1,649,655	1,676,440
Net per Balance Sheet					919,491				844,606	919,491
Goodwill [Roll Forward]
Beginning balance				2,008,231				2,099,783	2,008,231	2,099,783
Acquisition of Argo Transdata									0
Foreign exchange									(106,919)	(91,552)
Ending balance					2,008,231				1,901,312	2,008,231
Security Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount					1,041,250				2,189,379	1,041,250
Accumulated Amortization					503,238				535,415	503,238
Net per Balance Sheet					538,012				1,653,964	538,012
Goodwill [Roll Forward]
Beginning balance				11,833,816				11,833,816	11,833,816	11,833,816
Acquisition of Argo Transdata									1,225,226
Foreign exchange									0	0
Ending balance					11,833,816				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
Accumulated Amortization					0				0	0
Net per Balance Sheet					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
Patents and Developed Technology [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount									3,519,564
Accumulated Amortization									2,185,070
Weighted-Average Amortization Period									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									2,494,261
Accumulated Amortization									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									1,025,303
Accumulated Amortization									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
Accumulated Amortization									0
Customer Relationships [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount									449,706
Accumulated Amortization									0
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									0
Accumulated Amortization									0
Customer Relationships [Member] | Security Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount									449,706
Accumulated Amortization									0
Customer Relationships [Member] | Metal Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount									0
Accumulated Amortization									0
Intellectual Property [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount									307,370
Accumulated Amortization									0
Weighted-Average Amortization Period									5 years
Intellectual Property [Member] | Industrial Hardware Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount									0
Accumulated Amortization									0
Intellectual Property [Member] | Security Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount									307,370
Accumulated Amortization									0
Intellectual Property [Member] | Metal Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount									0
Accumulated Amortization									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
Accumulated Amortization									0
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									0
Accumulated Amortization									0
Non-Compete Agreements [Member] | Security Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount									407,000
Accumulated Amortization									0
Non-Compete Agreements [Member] | Metal Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount									0
Accumulated Amortization									$ 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	0
Threshold percentage of concentration risk (in hundredths)									10.00%	10.00%