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Segment Reporting: Schedule of Segment Reporting by Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Net sales $ 9,023,398 $ 8,364,390 $ 18,221,094 $ 17,669,339  
Depreciation     640,848 660,489  
Accounts receivable - Less allowances of $162,000 and $170,000, respectively 6,842,227   6,842,227   $ 5,647,984
Inventories, net 9,615,373   9,615,373   8,519,780
Net property, plant and equipment 12,044,719   12,044,719   $ 12,473,864
Fastener          
Net sales 8,059,612 7,142,044 16,213,445 15,290,722  
Depreciation 281,841 291,342 563,682 582,525  
Segment operating profit 499,531 574,638 1,335,038 1,501,796  
Selling and Administrative Expenses 0 0 0 0  
Interest income 0 0 0 0  
Capital expenditures 65,482 228,750 178,346 333,274  
Accounts receivable - Less allowances of $162,000 and $170,000, respectively 6,330,240 5,443,167 6,330,240 5,443,167  
Inventories, net 8,341,612 5,861,971 8,341,612 5,861,971  
Net property, plant and equipment 9,396,988 10,214,388 9,396,988 10,214,388  
Other Assets 0 0 0 0  
Assembly Equipment          
Net sales 963,786 1,222,346 2,007,649 2,378,617  
Depreciation 33,363 33,533 66,726 67,066  
Segment operating profit 191,011 340,002 423,390 636,702  
Selling and Administrative Expenses 0 0 0 0  
Interest income 0 0 0 0  
Capital expenditures 0 0 0 0  
Accounts receivable - Less allowances of $162,000 and $170,000, respectively 511,987 466,811 511,987 466,811  
Inventories, net 1,273,761 1,194,698 1,273,761 1,194,698  
Net property, plant and equipment 1,367,179 1,501,796 1,367,179 1,501,796  
Other Assets 0 0 0 0  
Unallocated Corporate          
Net sales 0 0 0 0  
Depreciation 5,220 5,449 10,440 10,898  
Segment operating profit 0 0 0 0  
Selling and Administrative Expenses (497,736) (512,526) (997,064) (1,056,298)  
Interest income 2,098 4,393 3,853 14,435  
Capital expenditures 25,627 0 33,357 11,939  
Accounts receivable - Less allowances of $162,000 and $170,000, respectively 0 0 0 0  
Inventories, net 0 0 0 0  
Net property, plant and equipment 1,260,552 1,103,343 1,260,552 1,103,343  
Other Assets $ 4,028,553 $ 6,635,401 $ 4,028,553 $ 6,635,401