Segment Information (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	$ 34,779,773	$ 39,247,980	$ 70,628,899	$ 73,940,154
Operating Profit	2,787,940	3,307,657	5,085,057	4,892,941
Interest expense	(64,626)	(84,776)	(133,195)	(170,852)
Other income	16,683	19,871	23,966	28,459
Income before income taxes	2,739,997	3,242,752	4,975,828	4,750,548
Industrial Hardware [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	15,064,647	16,399,474	29,195,398	31,615,564
Operating Profit	1,470,569	1,459,117	2,566,403	2,063,104
Security Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	12,420,846	12,977,338	24,967,882	23,957,489
Operating Profit	890,165	988,732	1,445,451	1,237,434
Metal Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	7,294,280	9,871,168	16,465,619	18,367,101
Operating Profit	$ 427,206	$ 859,808	$ 1,073,203	$ 1,592,403