Intangibles (Details) - USD ($)	3 Months Ended	12 Months Ended
	Apr. 01, 2017	Dec. 31, 2016
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	$ 4,377,312	$ 4,358,510
Accumulated Amortization	2,690,497	2,594,061
Net as per Balance Sheet	$ 1,686,815	$ 1,764,449
Weighted Average Amortization Period	12 years 3 months 18 days	12 years 3 months 18 days
Industrial Hardware Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	$ 2,166,937	$ 2,159,060
Accumulated Amortization	1,550,992	1,529,675
Net as per Balance Sheet	615,945	629,385
Security Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	2,210,375	2,199,450
Accumulated Amortization	1,139,505	1,064,386
Net as per Balance Sheet	1,070,870	1,135,064
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	3,213,236	3,194,434
Accumulated Amortization	$ 2,166,663	$ 2,128,431
Weighted Average Amortization Period	15 years 6 months	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	$ 2,166,937	$ 2,159,060
Accumulated Amortization	1,550,992	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	1,046,299	1,035,374
Accumulated Amortization	615,671	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
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	$ 202,368	$ 179,882
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	202,368	179,882
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	$ 183,150	$ 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
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	183,150	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
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	$ 138,316	$ 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
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	138,316	122,948
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