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Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Net sales $ 8,386,756 $ 8,854,274 $ 27,305,591 $ 28,271,399  
Depreciation 309,180 311,915 922,347 919,392  
Segment operating profit 1,085,849 1,265,494 3,805,109 4,757,699  
Selling and administrative expenses (603,809) (596,358) (1,911,509) (1,948,769)  
Interest income 18,795 10,193 49,512 28,515  
Capital expenditures 271,888 844,190 1,071,046 1,782,886  
Accounts receivable, net 5,871,092 [1] 5,896,286 5,871,092 [1] 5,896,286 $ 5,323,519 [1]
Inventories, net 5,088,117 4,804,294 5,088,117 4,804,294 4,537,693
Property, plant and equipment, net 12,599,257 12,560,597 12,599,257 12,560,597 $ 12,450,558
Other assets 8,452,225 8,183,787 8,452,225 8,183,787  
Fastener          
Net sales 7,486,193 8,089,800 24,319,725 25,395,165  
Depreciation 275,820 272,212 822,267 801,485  
Segment operating profit 768,247 1,031,736 2,716,020 3,745,167  
Selling and administrative expenses 0 0 0 0  
Interest income 0 0 0 0  
Capital expenditures 263,563 842,048 949,333 1,550,070  
Accounts receivable, net 5,576,022 5,611,689 5,576,022 5,611,689  
Inventories, net 4,134,219 3,766,136 4,134,219 3,766,136  
Property, plant and equipment, net 10,409,913 10,457,807 10,409,913 10,457,807  
Other assets 0 0 0 0  
Assembly Equipment          
Net sales 900,563 764,474 2,985,866 2,876,234  
Depreciation 24,390 22,063 73,170 65,677  
Segment operating profit 317,602 233,758 1,089,089 1,012,532  
Selling and administrative expenses 0 0 0 0  
Interest income 0 0 0 0  
Capital expenditures 8,325 2,142 121,713 190,690  
Accounts receivable, net 295,070 284,597 295,070 284,597  
Inventories, net 953,898 1,038,158 953,898 1,038,158  
Property, plant and equipment, net 1,613,245 1,594,023 1,613,245 1,594,023  
Other assets 0 0 0 0  
Unallocated Corporate          
Net sales 0 0 0 0  
Depreciation 8,970 17,640 26,910 52,230  
Segment operating profit 0 0 0 0  
Selling and administrative expenses (603,809) (596,358) (1,911,509) (1,948,769)  
Interest income 18,795 10,193 49,512 28,515  
Capital expenditures 0 0 0 42,126  
Accounts receivable, net 0 0 0 0  
Inventories, net 0 0 0 0  
Property, plant and equipment, net 576,099 508,767 576,099 508,767  
Other assets $ 8,452,225 $ 8,183,787 $ 8,452,225 $ 8,183,787  
[1] Net of allowance of $150,000.