Intangibles (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 29, 2013	Dec. 29, 2012
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Net as per Balance Sheet	$ 1,569,556	$ 1,653,957
Patents and developed technology [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	3,704,646	3,759,555
Accumulated Amortization	2,135,090	2,105,598
Net as per Balance Sheet	1,569,556	1,653,957
Weighted Average Amortization Period	15 years 4 months 24 days	15 years 9 months 18 days
Patents and developed technology [Member] | Industrial Hardware Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	2,656,675	2,732,307
Accumulated Amortization	1,648,103	1,652,199
Net as per Balance Sheet	1,008,572	1,080,108
Patents and developed technology [Member] | Security Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	1,042,132	1,021,409
Accumulated Amortization	481,149	447,732
Net as per Balance Sheet	560,983	573,677
Patents and developed technology [Member] | Metal Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	5,839	5,839
Accumulated Amortization	5,838	5,667
Net as per Balance Sheet	$ 1	$ 172
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
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Useful lives of intangible assets	5 years
Non-compete agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Useful lives of intangible assets	5 years