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Segment Reporting: Schedule of Segment Reporting, by Segment (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Net sales $ 7,645,259 $ 8,188,905 $ 19,325,234 $ 25,686,034  
Depreciation     1,014,916 1,029,998  
Accounts receivable - Less allowances of $160,000 and $140,000, respectively 5,346,916   5,346,916   $ 4,609,314
Inventories, net 4,944,806   4,944,806   4,951,177
Net property, plant and equipment 13,034,794   13,034,794   $ 13,674,053
Fastener          
Net sales 7,024,416 7,306,895 17,275,555 22,702,719  
Depreciation 297,533 305,082 891,177 907,887  
Segment operating profit (loss) 783,234 605,503 533,742 1,681,703  
Selling and Administrative Expenses 0 0 0 0  
Interest income 0 0 0 0  
Capital expenditures 28,165 267,179 225,707 1,307,859  
Accounts receivable - Less allowances of $160,000 and $140,000, respectively 5,059,552 5,174,674 5,059,552 5,174,674  
Inventories, net 3,880,189 4,294,760 3,880,189 4,294,760  
Net property, plant and equipment 10,381,970 11,126,165 10,381,970 11,126,165  
Other Assets 0 0 0 0  
Assembly Equipment          
Net sales 620,843 882,010 2,049,679 2,983,315  
Depreciation 32,869 32,507 98,607 92,884  
Segment operating profit (loss) 103,759 336,320 319,340 988,196  
Selling and Administrative Expenses 0 0 0 0  
Interest income 0 0 0 0  
Capital expenditures 0 2,576 0 228,900  
Accounts receivable - Less allowances of $160,000 and $140,000, respectively 287,364 439,348 287,364 439,348  
Inventories, net 1,064,617 1,181,573 1,064,617 1,181,573  
Net property, plant and equipment 1,588,157 1,715,513 1,588,157 1,715,513  
Other Assets 0 0 0 0  
Unallocated Corporate          
Net sales 0 0 0 0  
Depreciation 8,377 9,742 25,132 29,227  
Segment operating profit (loss) 0 0 0 0  
Selling and Administrative Expenses (493,370) (563,705) (1,547,606) (1,705,159)  
Interest income 20,512 36,679 79,711 108,458  
Capital expenditures 92,140 0 149,950 26,025  
Accounts receivable - Less allowances of $160,000 and $140,000, respectively 0 0 0 0  
Inventories, net 0 0 0 0  
Net property, plant and equipment 1,064,667 949,254 1,064,667 949,254  
Other Assets $ 8,108,571 $ 8,195,043 $ 8,108,571 $ 8,195,043