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Segment Reporting: Schedule of Segment Reporting by Segment (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Net sales $ 8,555,731 $ 7,645,259 $ 26,225,070 $ 19,325,234  
Depreciation     990,983 1,014,916  
Accounts receivable - Less allowances of $170,000 6,074,743   6,074,743   $ 5,163,450
Inventories, net 7,745,270   7,745,270   5,153,294
Net property, plant and equipment 12,718,152   12,718,152   $ 13,150,884
Fastener          
Net sales 7,552,619 7,024,416 22,843,341 17,275,555  
Depreciation 291,512 297,533 874,037 891,177  
Segment operating profit 480,288 783,234 1,982,084 533,742  
Selling and Administrative Expenses 0 0 0 0  
Interest income 0 0 0 0  
Capital expenditures 77,007 28,165 410,281 225,707  
Accounts receivable - Less allowances of $170,000 5,623,045 5,059,552 5,623,045 5,059,552  
Inventories, net 6,553,617 3,880,189 6,553,617 3,880,189  
Net property, plant and equipment 9,986,600 10,381,970 9,986,600 10,381,970  
Other Assets 0 0 0 0  
Assembly Equipment          
Net sales 1,003,112 620,843 3,381,729 2,049,679  
Depreciation 33,534 32,869 100,600 98,607  
Segment operating profit 215,869 103,759 852,571 319,340  
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 $170,000 451,698 287,364 451,698 287,364  
Inventories, net 1,191,653 1,064,617 1,191,653 1,064,617  
Net property, plant and equipment 1,468,262 1,588,157 1,468,262 1,588,157  
Other Assets 0 0 0 0  
Unallocated Corporate          
Net sales 0 0 0 0  
Depreciation 5,448 8,377 16,346 25,132  
Segment operating profit 0 0 0 0  
Selling and Administrative Expenses (491,547) (493,370) (1,547,845) (1,547,606)  
Interest income 3,049 20,512 17,484 79,711  
Capital expenditures 165,395 92,140 177,334 149,950  
Accounts receivable - Less allowances of $170,000 0 0 0 0  
Inventories, net 0 0 0 0  
Net property, plant and equipment 1,263,290 1,064,667 1,263,290 1,064,667  
Other Assets $ 6,093,884 $ 8,108,571 $ 6,093,884 $ 8,108,571