Intangibles (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 29, 2014	Dec. 28, 2013
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Net as per Balance Sheet	$ 1,431,749	$ 1,457,503
Patents and developed technology [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	3,613,412	3,637,181
Accumulated Amortization	2,181,663	2,179,678
Net as per Balance Sheet	1,431,749	1,457,503
Weighted Average Amortization Period	15 years 10 months 24 days	16 years
Patents and developed technology [Member] | Industrial Hardware Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	2,569,067	2,595,931
Accumulated Amortization	1,662,516	1,676,440
Net as per Balance Sheet	906,551	919,491
Patents and developed technology [Member] | Security Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	1,044,345	1,041,250
Accumulated Amortization	519,147	503,238
Net as per Balance Sheet	525,198	538,012
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
Net as per Balance Sheet	$ 0	$ 0
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