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Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Net sales $ 9,596,395 $ 9,283,791  
Depreciation 299,355 312,645  
Segment operating profit 1,659,560 1,262,636  
Selling and adminstrative expenses (685,262) (590,996)  
Interest income 8,759 6,833  
Capital expenditures 599,381 413,684  
Accounts receivable, net 6,111,917 [1] 6,267,309 $ 5,438,332 [1]
Inventories, net 4,919,704 5,035,548 4,538,212
Property, plant and equipment, net 11,998,469 10,977,946 $ 11,698,443
Other assets 7,418,596 6,690,777  
Fastener      
Net sales 8,447,329 8,400,497  
Depreciation 260,823 273,752  
Segment operating profit 1,226,361 1,018,047  
Selling and adminstrative expenses 0 0  
Interest income 0 0  
Capital expenditures 409,785 350,817  
Accounts receivable, net 5,701,331 5,815,951  
Inventories, net 3,951,985 4,187,776  
Property, plant and equipment, net 9,858,184 9,344,594  
Other assets 0 0  
Assembly Equipment      
Net sales 1,149,066 883,294  
Depreciation 21,582 20,097  
Segment operating profit 433,199 244,589  
Selling and adminstrative expenses 0 0  
Interest income 0 0  
Capital expenditures 181,368 54,775  
Accounts receivable, net 410,586 451,358  
Inventories, net 967,719 847,772  
Property, plant and equipment, net 1,628,796 1,147,395  
Other assets 0 0  
UnallocatedCorporate      
Net sales 0 0  
Depreciation 16,950 18,796  
Segment operating profit 0 0  
Selling and adminstrative expenses (685,262) (590,996)  
Interest income 8,759 6,833  
Capital expenditures 8,228 8,092  
Accounts receivable, net 0 0  
Inventories, net 0 0  
Property, plant and equipment, net 511,489 485,957  
Other assets $ 7,418,596 $ 6,690,777  
[1] Net of allowance of $150,000.