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Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Net sales $ 9,435,508 $ 9,820,730 $ 18,918,835 $ 19,417,125  
Depreciation 309,970 308,122 613,167 607,477  
Segment operating profit 1,282,093 1,832,645 2,719,260 3,492,205  
Selling and administrative expenses (626,772) (667,149) (1,307,700) (1,352,411)  
Interest income 16,034 9,563 30,717 18,322  
Capital expenditures 621,844 339,315 799,158 938,696  
Accounts receivable, net 5,952,843 [1] 6,278,622 5,952,843 [1] 6,278,622 $ 5,323,519 [1]
Inventories, net 4,995,843 4,991,208 4,995,843 4,991,208 4,537,693
Property, plant and equipment, net 12,636,549 12,028,322 12,636,549 12,028,322 $ 12,450,558
Other assets 8,179,902 7,791,988 8,179,902 7,791,988  
Fastener          
Net sales 8,097,344 8,858,036 16,833,532 17,305,365  
Depreciation 276,610 268,450 546,447 529,273  
Segment operating profit 756,226 1,487,070 1,947,773 2,713,431  
Selling and administrative expenses 0 0 0 0  
Interest income 0 0 0 0  
Capital expenditures 510,981 298,237 685,770 708,022  
Accounts receivable, net 5,588,046 5,979,118 5,588,046 5,979,118  
Inventories, net 3,990,878 3,976,986 3,990,878 3,976,986  
Property, plant and equipment, net 10,422,170 9,887,971 10,422,170 9,887,971  
Other assets 0 0 0 0  
Assembly Equipment          
Net sales 1,338,164 962,694 2,085,303 2,111,760  
Depreciation 24,390 22,032 48,780 43,614  
Segment operating profit 525,867 345,575 771,487 778,774  
Selling and administrative expenses 0 0 0 0  
Interest income 0 0 0 0  
Capital expenditures 110,863 7,180 113,388 188,548  
Accounts receivable, net 364,797 299,504 364,797 299,504  
Inventories, net 1,004,965 1,014,222 1,004,965 1,014,222  
Property, plant and equipment, net 1,629,310 1,613,944 1,629,310 1,613,944  
Other assets 0 0 0 0  
Unallocated Corporate          
Net sales 0 0 0 0  
Depreciation 8,970 17,640 17,940 34,590  
Segment operating profit 0 0 0 0  
Selling and administrative expenses (626,772) (667,149) (1,307,700) (1,352,411)  
Interest income 16,034 9,563 30,717 18,322  
Capital expenditures 0 33,898 0 42,126  
Accounts receivable, net 0 0 0 0  
Inventories, net 0 0 0 0  
Property, plant and equipment, net 585,069 526,407 585,069 526,407  
Other assets $ 8,179,902 $ 7,791,988 $ 8,179,902 $ 7,791,988  
[1] Net of allowance of $150,000.