Intangibles (Details) - USD ($)	3 Months Ended	12 Months Ended
	Apr. 02, 2016	Jan. 03, 2015	Jan. 02, 2016
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	$ 4,457,144		$ 4,400,109
Accumulated Amortization	2,424,545		2,286,533
Net as per Balance Sheet	$ 2,032,599		2,113,576
Weighted Average Amortization Period	12 years 7 months 6 days	12 years 7 months 6 days
Industrial Hardware Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	$ 2,262,367		2,206,852
Accumulated Amortization	1,543,456		1,478,692
Net as per Balance Sheet	718,911		728,160
Security Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	2,194,777		2,193,257
Accumulated Amortization	881,089		807,841
Net as per Balance Sheet	1,313,688		1,385,416
Metal Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	0		0
Accumulated Amortization	0		0
Net as per Balance Sheet	0		0
Patents and Developed Technology [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	3,293,068		3,236,033
Accumulated Amortization	$ 2,133,526		2,053,718
Weighted Average Amortization Period	15 years 10 months 24 days	15 years 10 months 24 days
Patents and Developed Technology [Member] | Industrial Hardware Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	$ 2,262,367		2,206,852
Accumulated Amortization	1,543,456		1,478,692
Patents and Developed Technology [Member] | Security Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	1,030,701		1,029,181
Accumulated Amortization	590,070		575,026
Patents and Developed Technology [Member] | Metal Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	0		0
Accumulated Amortization	0		0
Customer Relationships [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	449,706		449,706
Accumulated Amortization	$ 112,426		89,941
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
Accumulated Amortization	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
Accumulated Amortization	112,426		89,941
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]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	407,000		407,000
Accumulated Amortization	$ 101,750		81,400
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
Accumulated Amortization	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
Accumulated Amortization	101,750		81,400
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
Intellectual Property [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	307,370		307,370
Accumulated Amortization	$ 76,843		61,474
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
Accumulated Amortization	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
Accumulated Amortization	76,843		61,474
Intellectual Property [Member] | Metal Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	0		0
Accumulated Amortization	$ 0		$ 0