Segment Information (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	$ 34,256,086	$ 39,644,050	$ 108,196,240	$ 121,699,533
Operating Profit	2,456,904	3,334,522	7,349,845	10,648,170
Interest expense	(78,629)	(93,238)	(249,481)	(281,142)
Other income	8,201	3,462	36,660	14,185
Income before income taxes	2,386,476	3,244,746	7,137,024	10,381,213
Industrial Hardware [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	15,067,122	18,656,171	46,682,686	55,610,830
Income before income taxes	1,444,830	2,048,559	3,507,935	6,138,342
Security Products [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	12,690,410	12,593,633	36,647,899	38,689,676
Income before income taxes	499,717	1,145,886	1,737,150	3,489,090
Metal Products [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	6,498,554	8,394,246	24,865,655	27,399,027
Income before income taxes	$ 512,357	$ 140,077	$ 2,104,760	$ 1,020,738