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Schedule of Segment Reporting Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Net sales $ 37,022,378 $ 36,174,604
Depreciation and amortization 1,242,357 1,261,446
Segment operating profit 6,040,026 4,674,131
Selling and administrative expenses (2,557,301) (2,186,933)
Other income 65,255 44,443
Capital expenditures 2,027,860 2,104,267
Accounts receivable, net [1] 5,323,519 5,438,332
Inventories, net 4,537,693 4,538,212
Property, plant and equipment, net 12,450,558 11,698,443
Other assets 8,892,539 8,022,959
Fastener    
Net sales 33,126,599 32,590,015
Depreciation and amortization 1,078,281 1,101,210
Segment operating profit 4,689,749 3,692,805
Selling and administrative expenses 0 0
Other income 0 0
Capital expenditures 1,683,953 1,545,533
Accounts receivable, net 5,036,251 5,084,535
Inventories, net 3,639,940 3,549,655
Property, plant and equipment, net 10,282,847 9,732,333
Other assets 0 0
Assembly Equipment    
Net sales 3,895,779 3,584,589
Depreciation and amortization 93,876 80,191
Segment operating profit 1,350,277 981,326
Selling and administrative expenses 0 0
Other income 0 0
Capital expenditures 189,568 455,139
Accounts receivable, net 287,268 353,797
Inventories, net 897,753 988,557
Property, plant and equipment, net 1,564,702 1,469,010
Other assets 0 0
Unallocated Corporate    
Net sales 0 0
Depreciation and amortization 70,200 80,045
Segment operating profit 0 0
Selling and administrative expenses (2,557,301) (2,186,933)
Other income 65,255 44,443
Capital expenditures 154,339 103,595
Accounts receivable, net 0 0
Inventories, net 0 0
Property, plant and equipment, net 603,009 497,100
Other assets $ 8,892,539 $ 8,022,959
[1] Net of allowance of $150,000.