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Segment Reporting: Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Net sales $ 9,792,784 $ 9,435,508 $ 19,804,425 $ 18,918,835  
Depreciation 327,017 309,970 653,537 613,167  
Segment operating profit 1,479,093 1,282,093 3,040,740 2,719,260  
Selling and administrative expenses (591,640) (626,772) (1,268,579) (1,307,700)  
Interest income 26,639 16,034 53,719 30,717  
Capital expenditures 409,291 621,844 635,718 799,158  
Accounts receivable, net 6,907,426 5,952,843 6,907,426 5,952,843 $ 5,326,650
Inventories, net 5,450,221 4,995,843 5,450,221 4,995,843 4,528,100
Property, plant and equipment, net 12,539,134 12,636,549 12,539,134 12,636,549 $ 12,556,953
Other assets 8,680,688 8,179,902 8,680,688 8,179,902  
Fastener          
Net sales 9,034,275 8,097,344 17,959,374 16,833,532  
Depreciation 292,378 276,610 584,259 546,447  
Segment operating profit 1,229,717 756,226 2,407,179 1,947,773  
Selling and administrative expenses 0 0 0 0  
Interest income 0 0 0 0  
Capital expenditures 281,692 510,981 465,919 685,770  
Accounts receivable, net 6,508,150 5,588,046 6,508,150 5,588,046  
Inventories, net 4,399,770 3,990,878 4,399,770 3,990,878  
Property, plant and equipment, net 10,164,570 10,422,170 10,164,570 10,422,170  
Other assets 0 0 0 0  
Assembly Equipment          
Net sales 758,509 1,338,164 1,845,051 2,085,303  
Depreciation 27,298 24,390 54,596 48,780  
Segment operating profit 249,376 525,867 633,561 771,487  
Selling and administrative expenses 0 0 0 0  
Interest income 0 0 0 0  
Capital expenditures 0 110,863 31,495 113,388  
Accounts receivable, net 399,276 364,797 399,276 364,797  
Inventories, net 1,050,451 1,004,965 1,050,451 1,004,965  
Property, plant and equipment, net 1,619,454 1,629,310 1,619,454 1,629,310  
Other assets 0 0 0 0  
Unallocated Corporate          
Net sales 0 0 0 0  
Depreciation 7,341 8,970 14,682 17,940  
Segment operating profit 0 0 0 0  
Selling and administrative expenses (591,640) (626,772) (1,268,579) (1,307,700)  
Interest income 26,639 16,034 53,719 30,717  
Capital expenditures 127,599 0 138,304 0  
Accounts receivable, net 0 0 0 0  
Inventories, net 0 0 0 0  
Property, plant and equipment, net 755,110 585,069 755,110 585,069  
Other assets $ 8,680,688 $ 8,179,902 $ 8,680,688 $ 8,179,902