Segment Reporting Information, by Segment (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012	Dec. 31, 2012
SalesRevenueNet	$ 9,327,643		$ 8,429,201	$ 18,453,379		$ 17,629,519
Depreciation	265,238		248,290	530,819		492,286
Segment profit	1,403,323		1,113,804	2,611,903		2,365,572
Selling and administrative expenses	(515,596)		(493,705)	(1,062,129)		(1,054,591)
Gain from disposal of equipment	42,486		27,500	42,486		57,500
Interest income	7,000		7,833	15,485		16,685
IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	937,213		655,432	1,607,745		1,385,166
Capital expenditures	1,892,359		376,641	1,974,949		513,406
Accounts receivable, net	5,801,140	[1]	5,420,892	5,801,140	[1]	5,420,892	4,577,932	[1]
Inventories, net	4,992,252		5,227,478	4,992,252		5,227,478	4,936,372
Net property, plant and equipment	9,474,282		7,916,645	9,474,282		7,916,645	8,077,866
Other assets	7,486,553		7,453,905	7,486,553		7,453,905
FastenerMember
SalesRevenueNet	8,463,688		7,605,981	16,766,432		15,940,101
Depreciation	231,989		216,207	464,468		428,121
Segment profit	1,165,813		882,371	2,161,977		1,932,807
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	1,862,043		269,281	1,911,022		406,046
Accounts receivable, net	5,449,624		5,055,675	5,449,624		5,055,675
Inventories, net	4,204,473		4,430,149	4,204,473		4,430,149
Net property, plant and equipment	7,762,120		6,131,318	7,762,120		6,131,318
Other assets	0		0	0		0
AssemblyEquipmentMember
SalesRevenueNet	863,955		823,220	1,686,947		1,689,418
Depreciation	14,050		14,125	28,100		28,250
Segment profit	237,510		231,433	449,926		432,765
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	30,316		68,203	59,863		68,203
Accounts receivable, net	351,516		365,217	351,516		365,217
Inventories, net	787,779		797,329	787,779		797,329
Net property, plant and equipment	1,138,081		1,137,267	1,138,081		1,137,267
Other assets	0		0	0		0
UnallocatedCorporateMember
SalesRevenueNet	0		0	0		0
Depreciation	19,199		17,958	38,251		35,915
Segment profit	0		0	0		0
Selling and administrative expenses	(515,596)		(493,705)	(1,062,129)		(1,054,591)
Gain from disposal of equipment	42,486		27,500	42,486		57,500
Interest income	7,000		7,833	15,485		16,685
Capital expenditures	0		39,157	4,064		39,157
Accounts receivable, net	0		0	0		0
Inventories, net	0		0	0		0
Net property, plant and equipment	574,081		648,060	574,081		648,060
Other assets	$ 7,486,553		$ 7,453,905	$ 7,486,553		$ 7,453,905

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