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Schedule of Segment Reporting Information (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Net sales $ 34,223,772 $ 30,915,122
Depreciation 993,951 971,496
Segment profit 4,548,947 3,622,033
Selling and administrative expenses (2,084,305) (2,005,960)
Other income 118,099 249,804
Income before income taxes 2,582,741 1,865,877
Capital expenditures 1,187,746 1,611,789
Accounts receivable, net 4,577,932 [1] 4,398,426 [2]
Inventories, net 4,936,372 5,212,040
Net property, plant and equipment 8,077,866 7,895,525
Other assets 8,319,333 7,352,273
FastenerMember
    
Net sales 30,999,163 27,832,279
Depreciation 859,045 836,062
Segment profit 3,775,045 2,997,799
Capital expenditures 1,018,734 1,510,036
Accounts receivable, net 4,275,890 4,143,186
Inventories, net 4,175,702 4,401,178
Net property, plant and equipment 6,363,280 6,153,394
AssemblyEquipmentMember
    
Net sales 3,224,609 3,082,843
Depreciation 59,199 62,463
Segment profit 773,902 624,234
Capital expenditures 68,203 61,283
Accounts receivable, net 302,042 255,240
Inventories, net 760,670 810,862
Net property, plant and equipment 1,106,318 1,097,314
UnallocatedCorporateMember
    
Depreciation 75,707 72,971
Selling and administrative expenses (2,084,305) (2,005,960)
Other income 118,099 249,804
Capital expenditures 100,809 40,470
Net property, plant and equipment 608,268 644,817
Other assets $ 8,319,333 $ 7,352,273
[1] Net of allowance of $150,000.
[2] Net of allowance of $140,000.