Intangibles (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 29, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Useful lives of intangible assets	15 years 7 months 6 days	11 years 8 months 12 days
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	$ 3,864,432	$ 5,871,762
Accumulated Amortization	2,175,970	4,101,754
Net as per Balance Sheet	1,688,462	1,770,008
Weighted Average Amortization Period	15 years 7 months 6 days	11 years 8 months 12 days
Industrial Hardware Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	2,832,582	2,790,725
Accumulated Amortization	1,714,969	1,588,667
Net as per Balance Sheet	1,117,613	1,202,058
Security Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	1,026,011	3,075,198
Accumulated Amortization	455,420	2,507,764
Net as per Balance Sheet	570,591	567,434
Metal Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	5,839	5,839
Accumulated Amortization	5,581	5,323
Net as per Balance Sheet	258	516
Technology and licenses [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful lives of intangible assets	5 years
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Weighted Average Amortization Period	5 years
Technology and licenses [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Useful lives of intangible assets	17 years
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Weighted Average Amortization Period	17 years
Patents and developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Useful lives of intangible assets	15 years 9 months 18 days	15 years 6 months
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	3,788,607	3,783,391
Accumulated Amortization	2,103,936	2,028,548
Weighted Average Amortization Period	15 years 9 months 18 days	15 years 6 months
Patents and developed technology [Member] | Industrial Hardware Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	2,756,757	2,714,900
Accumulated Amortization	1,642,935	1,528,007
Patents and developed technology [Member] | Security Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	1,026,011	1,062,652
Accumulated Amortization	455,420	495,218
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	5,581	5,323
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Useful lives of intangible assets	5 years	5 years
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	45,825	1,967,636
Accumulated Amortization	43,534	1,958,471
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	45,825	45,825
Accumulated Amortization	43,534	36,660
Customer relationships [Member] | Security Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	0	1,921,811
Accumulated Amortization	0	1,921,811
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]
Finite-Lived Intangible Assets [Line Items]
Useful lives of intangible assets	5 years	5 years
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	30,000	120,735
Accumulated Amortization	28,500	114,735
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	30,000	30,000
Accumulated Amortization	28,500	24,000
Non-compete agreements [Member] | Security Products Segment [Member]
Gross carrying amount and accumulated amortization of amortizable intangible assets [Abstract]
Gross Amount	0	90,735
Accumulated Amortization	0	90,735
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