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Segment Reporting: Schedule of Segment Reporting, by Segment (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Net sales $ 4,103,520 $ 8,875,451 $ 11,679,975 $ 17,497,129  
Depreciation     676,137 682,667  
Accounts receivable - Less allowances of $160,000 and $140,000, respectively 3,557,637   3,557,637   $ 4,609,314
Inventories, net 4,745,786   4,745,786   4,951,177
Net property, plant and equipment 13,253,268   13,253,268   $ 13,674,053
Fastener          
Net sales 3,513,742 7,816,704 10,251,139 15,395,824  
Depreciation 297,534 305,082 593,644 602,805  
Segment operating profit (loss) (653,510) 487,305 (249,492) 1,076,200  
Selling and Administrative Expenses 0 0 0 0  
Interest income 0 0 0 0  
Capital expenditures 29,545 284,573 197,542 1,040,680  
Accounts receivable - Less allowances of $160,000 and $140,000, respectively 3,327,037 5,426,139 3,327,037 5,426,139  
Inventories, net 3,782,622 4,996,608 3,782,622 4,996,608  
Net property, plant and equipment 10,651,338 11,164,067 10,651,338 11,164,067  
Other Assets 0 0 0 0  
Assembly Equipment          
Net sales 589,778 1,058,747 1,428,836 2,101,305  
Depreciation 32,869 31,453 65,738 60,377  
Segment operating profit (loss) 31,010 315,802 215,581 651,876  
Selling and Administrative Expenses 0 0 0 0  
Interest income 0 0 0 0  
Capital expenditures 0 102,324 0 226,324  
Accounts receivable - Less allowances of $160,000 and $140,000, respectively 230,600 361,216 230,600 361,216  
Inventories, net 963,164 1,102,215 963,164 1,102,215  
Net property, plant and equipment 1,621,026 1,745,444 1,621,026 1,745,444  
Other Assets 0 0 0 0  
Unallocated Corporate          
Net sales 0 0 0 0  
Depreciation 8,378 9,743 16,755 19,485  
Segment operating profit (loss) 0 0 0 0  
Selling and Administrative Expenses (503,340) (548,052) (1,054,236) (1,141,454)  
Interest income 25,324 35,504 59,199 71,779  
Capital expenditures 57,810 0 57,810 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 980,904 958,997 980,904 958,997  
Other Assets $ 8,859,829 $ 7,002,868 $ 8,859,829 $ 7,002,868