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Segment Reporting: Schedule of Segment Reporting by Segment (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Net sales $ 9,197,696 $ 9,304,949  
Depreciation 320,424 330,165  
Accounts receivable - Less allowances of $162,000 and $170,000, respectively 6,638,411   $ 5,647,984
Inventories, net 9,613,240   8,519,780
Net property, plant and equipment 12,274,034   $ 12,473,864
Fastener      
Net sales 8,153,833 8,148,678  
Depreciation 281,841 291,183  
Segment operating profit 835,507 927,158  
Selling and Administrative Expenses 0 0  
Interest income 0 0  
Capital expenditures 112,864 104,524  
Accounts receivable - Less allowances of $162,000 and $170,000, respectively 6,151,706 6,222,588  
Inventories, net 8,299,454 5,055,332  
Net property, plant and equipment 9,613,347 10,276,980  
Other Assets 0 0  
Assembly Equipment      
Net sales 1,043,863 1,156,271  
Depreciation 33,363 33,533  
Segment operating profit 232,379 296,700  
Selling and Administrative Expenses 0 0  
Interest income 0 0  
Capital expenditures 0 0  
Accounts receivable - Less allowances of $162,000 and $170,000, respectively 486,705 647,303  
Inventories, net 1,313,786 1,256,628  
Net property, plant and equipment 1,400,542 1,535,329  
Other Assets 0 0  
Unallocated Corporate      
Net sales 0 0  
Depreciation 5,220 5,449  
Segment operating profit 0 0  
Selling and Administrative Expenses (499,328) (543,772)  
Interest income 1,755 10,042  
Capital expenditures 7,730 11,939  
Accounts receivable - Less allowances of $162,000 and $170,000, respectively 0 0  
Inventories, net 0 0  
Net property, plant and equipment 1,260,145 1,108,792  
Other Assets $ 4,440,615 $ 6,450,577