Schedule of Segment Reporting Information, by Segment (Details) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013
Net sales	$ 8,995,825		$ 9,461,778	$ 28,446,927		$ 27,915,157
Depreciation	313,764		270,870	932,500		801,689
Segment profit	1,268,318		1,681,812	4,048,167		4,293,715
Selling and administrative expenses	(504,849)		(539,643)	(1,586,833)		(1,601,772)
Gain from disposal of equipment	(1,087)		74,235	17,613		116,721
Interest income	6,375		7,801	19,237		23,286
Capital expenditures	549,049		785,371	1,349,136		2,760,320
Accounts receivable, net	5,961,305	[1]	6,248,403	5,961,305	[1]	6,248,403	5,510,770	[1]
Inventories, net	5,282,751		4,894,521	5,282,751		4,894,521	4,880,788
Property, plant and equipment, net	10,824,669		9,988,018	10,824,669		9,988,018	10,409,120
Other assets	7,543,989		7,658,231	7,543,989		7,658,231
Income before income taxes	768,757		1,224,205	2,498,184		2,831,950
Fastener
Net sales	8,295,936		8,631,105	26,148,265		25,397,537
Depreciation	279,258		237,621	829,612		702,089
Segment profit	1,111,165		1,453,799	3,489,617		3,615,776
Selling and administrative expenses	0		0	0		0
Gain from disposal of equipment	0		0	0		0
Interest income	0		0	0		0
Capital expenditures	532,879		518,150	1,302,214		2,429,172
Accounts receivable, net	5,615,498		5,873,916	5,615,498		5,873,916
Inventories, net	4,479,552		3,994,869	4,479,552		3,994,869
Property, plant and equipment, net	9,199,056		8,309,105	9,199,056		8,309,105
Other assets	0		0	0		0
Assembly Equipment
Net sales	699,889		830,673	2,298,662		2,517,620
Depreciation	16,066		14,050	48,198		42,150
Segment profit	157,153		228,013	558,550		677,939
Selling and administrative expenses	0		0	0		0
Gain from disposal of equipment	0		0	0		0
Interest income	0		0	0		0
Capital expenditures	0		0	21,540		59,863
Accounts receivable, net	345,807		374,487	345,807		374,487
Inventories, net	803,199		899,652	803,199		899,652
Property, plant and equipment, net	1,110,475		1,124,031	1,110,475		1,124,031
Other assets	0		0	0		0
Unallocated Corporate
Net sales	0		0	0		0
Depreciation	18,440		19,199	54,690		57,450
Segment profit	0		0	0		0
Selling and administrative expenses	(504,849)		(539,643)	(1,586,833)		(1,601,772)
Gain from disposal of equipment	(1,087)		74,235	17,613		116,721
Interest income	6,375		7,801	19,237		23,286
Capital expenditures	16,170		267,221	25,382		271,285
Accounts receivable, net	0		0	0		0
Inventories, net	0		0	0		0
Property, plant and equipment, net	515,138		554,882	515,138		554,882
Other assets	$ 7,543,989		$ 7,658,231	$ 7,543,989		$ 7,658,231

[1] Net of allowance of $150,000.