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Segment Reporting (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net sales $ 8,537,639 $ 7,821,606 $ 26,167,158 $ 23,770,078
Depreciation     743,650 723,368
Gain from the disposal of property and equipment   800 57,500 189,863
Fastener Segment
        
Net sales 7,841,672 6,913,898 23,781,773 21,330,559
Depreciation 216,732 208,054 644,853 621,002
Segment profit 1,024,865 715,701 2,957,672 2,233,530
Capital expenditures 66,626 273,484 472,672 904,761
Accounts receivable, net 5,061,072 4,943,928 5,061,072 4,943,928
Inventories, net 4,392,211 4,008,132 4,392,211 4,008,132
Property, plant and equipment, net 5,981,212 5,760,757 5,981,212 5,760,757
Assembly Equipment Segment
        
Net sales 695,967 907,708 2,385,385 2,439,519
Depreciation 14,725 15,352 42,975 47,106
Segment profit 144,816 257,288 577,581 570,065
Capital expenditures     68,203 61,265
Accounts receivable, net 392,121 391,877 392,121 391,877
Inventories, net 822,550 820,805 822,550 820,805
Property, plant and equipment, net 1,122,542 1,112,653 1,122,542 1,112,653
Unallocated Corporate Segment
        
Depreciation 19,907 18,420 55,822 55,260
Selling and administrative expenses 504,524 511,943 1,559,115 1,505,087
Gain from the disposal of property and equipment   800 57,500 189,863
Interest Income 8,185 9,794 24,870 32,812
Capital expenditures     39,157 37,729
Property, plant and equipment, net 628,153 662,528 628,153 662,528
Other assets $ 8,150,878 $ 7,499,124 $ 8,150,878 $ 7,499,124