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Segment Reporting: Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Net sales $ 8,856,049 $ 8,386,756 $ 28,660,474 $ 27,305,591  
Depreciation 319,645 309,180 973,182 922,347  
Segment operating profit 896,197 1,085,849 3,936,937 3,805,109  
Selling and administrative expenses (563,347) (603,809) (1,831,926) (1,911,509)  
Interest income 30,899 18,795 84,618 49,512  
Capital expenditures 1,006,736 271,888 1,642,454 1,071,046  
Accounts receivable, net 6,502,374 5,871,092 6,502,374 5,871,092 $ 5,326,650
Inventories, net 5,254,333 5,088,117 5,254,333 5,088,117 4,528,100
Property, plant and equipment, net 13,226,225 12,599,257 13,226,225 12,599,257 $ 12,556,953
Other assets 8,446,731 8,452,225 8,446,731 8,452,225  
Fastener          
Net sales 7,936,798 7,486,193 25,896,172 24,319,725  
Depreciation 281,418 275,820 865,677 822,267  
Segment operating profit 599,188 768,247 3,006,367 2,716,020  
Selling and administrative expenses 0 0 0 0  
Interest income 0 0 0 0  
Capital expenditures 813,649 263,563 1,279,568 949,333  
Accounts receivable, net 5,961,946 5,576,022 5,961,946 5,576,022  
Inventories, net 4,226,263 4,134,219 4,226,263 4,134,219  
Property, plant and equipment, net 10,696,801 10,409,913 10,696,801 10,409,913  
Other assets 0 0 0 0  
Assembly Equipment          
Net sales 919,251 900,563 2,764,302 2,985,866  
Depreciation 28,358 24,390 82,954 73,170  
Segment operating profit 297,009 317,602 930,570 1,089,089  
Selling and administrative expenses 0 0 0 0  
Interest income 0 0 0 0  
Capital expenditures 5,489 8,325 36,984 121,713  
Accounts receivable, net 540,428 295,070 540,428 295,070  
Inventories, net 1,028,070 953,898 1,028,070 953,898  
Property, plant and equipment, net 1,596,585 1,613,245 1,596,585 1,613,245  
Other assets 0 0 0 0  
Unallocated Corporate          
Net sales 0 0 0 0  
Depreciation 9,869 8,970 24,551 26,910  
Segment operating profit 0 0 0 0  
Selling and administrative expenses (563,347) (603,809) (1,831,926) (1,911,509)  
Interest income 30,899 18,795 84,618 49,512  
Capital expenditures 187,598 0 325,902 0  
Accounts receivable, net 0 0 0 0  
Inventories, net 0 0 0 0  
Property, plant and equipment, net 932,839 576,099 932,839 576,099  
Other assets $ 8,446,731 $ 8,452,225 $ 8,446,731 $ 8,452,225