Segment Information (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	$ 35,803,405	$ 34,256,086	$ 106,432,304	$ 108,196,240
Operating Profit	3,748,873	2,456,904	8,833,930	7,349,845
Interest expense	(60,680)	(78,629)	(193,875)	(249,481)
Other income	14,030	8,201	37,996	36,660
Income before income taxes	3,702,223	2,386,476	8,678,051	7,137,024
Industrial Hardware [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	15,006,948	15,067,122	44,202,346	46,682,686
Operating Profit	1,428,040	1,444,830	3,994,443	3,507,935
Security Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	12,780,359	12,690,410	37,748,241	36,647,899
Operating Profit	1,643,159	499,717	3,088,610	1,737,150
Metal Products [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues, sales to unaffiliated customers	8,016,098	6,498,554	24,481,717	24,865,655
Operating Profit	$ 677,674	$ 512,357	$ 1,750,877	$ 2,104,760