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Schedule of Segment Reporting Information, by Segment (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Net sales $ 9,125,736 $ 9,200,318  
Depreciation 265,581 243,996  
Segment profit 1,208,580 1,251,768  
Selling and administrative expenses (546,533) (560,886)  
Gain from disposal of equipment   30,000  
Interest income 8,485 8,852  
Income before income taxes 670,532 729,734  
Capital expenditures 82,590 136,765  
Accounts receivable, net 5,863,016 [1] 6,210,192 4,577,932 [1]
Inventories, net 5,284,492 5,065,446 4,936,372
Net property, plant and equipment 7,894,875 7,788,294 8,077,866
Other assets 7,886,325 6,740,367  
FastenerMember
      
Net sales 8,302,744 8,334,120  
Depreciation 232,479 211,914  
Segment profit 996,164 1,050,436  
Selling and administrative expenses 0 0  
Gain from disposal of equipment   0  
Interest income 0 0  
Capital expenditures 48,979 136,765  
Accounts receivable, net 5,481,700 5,806,019  
Inventories, net 4,485,868 4,306,404  
Net property, plant and equipment 6,179,780 6,078,245  
Other assets 0 0  
AssemblyEquipmentMember
      
Net sales 822,992 866,198  
Depreciation 14,050 14,125  
Segment profit 212,416 201,332  
Selling and administrative expenses 0 0  
Gain from disposal of equipment   0  
Interest income 0 0  
Capital expenditures 29,547 0  
Accounts receivable, net 381,316 404,173  
Inventories, net 798,624 759,042  
Net property, plant and equipment 1,121,815 1,083,189  
Other assets 0 0  
UnallocatedCorporateMember
      
Net sales 0 0  
Depreciation 19,052 17,957  
Segment profit 0 0  
Selling and administrative expenses (546,533) (560,886)  
Gain from disposal of equipment   30,000  
Interest income 8,485 8,852  
Capital expenditures 4,064 0  
Accounts receivable, net 0 0  
Inventories, net 0 0  
Net property, plant and equipment 593,280 626,860  
Other assets $ 7,886,325 $ 6,740,367  
[1] Net of allowance of $150,000.