Segment Information (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	$ 39,247,980	$ 41,559,589	$ 73,940,154	$ 82,055,483
Operating Profit	3,307,657	4,144,234	4,892,941	7,313,648
Interest expense	(84,776)	(98,667)	(170,852)	(187,904)
Other income	19,871	4,587	28,459	10,723
Income before income taxes	3,242,752	4,050,154	4,750,548	7,136,467
Industrial Hardware [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	16,399,474	17,746,959	31,615,564	36,954,659
Income before income taxes	1,459,117	2,125,226	2,063,104	4,089,783
Security Products [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	12,977,338	13,981,220	23,957,489	26,096,043
Income before income taxes	988,732	1,547,636	1,237,434	2,343,204
Metal Products [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	9,871,168	9,831,410	18,367,101	19,004,781
Income before income taxes	$ 859,808	$ 471,372	$ 1,592,403	$ 880,661