Intangibles (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 28, 2014	Dec. 28, 2013
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Net as per Balance Sheet	$ 1,436,689	$ 1,457,503
Patents and developed technology [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	3,710,371	3,637,181
Accumulated Amortization	2,273,682	2,179,678
Net as per Balance Sheet	1,436,689	1,457,503
Weighted Average Amortization Period	15 years 9 months 18 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	2,658,566	2,595,931
Accumulated Amortization	1,730,696	1,676,440
Net as per Balance Sheet	927,870	919,491
Patents and developed technology [Member] | Security Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	1,051,805	1,041,250
Accumulated Amortization	542,986	503,238
Net as per Balance Sheet	508,819	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