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6 - Segment Information: Schedule of Segment Reporting Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Net Sales $ 27,590,653 $ 32,873,002
Depreciation and Amortization 1,347,305 1,382,235
Accounts receivable, net 5,163,450 4,609,314
Inventories, net 5,153,294 4,951,177
Property, plant and equipment, net 13,150,884 13,674,053
Fastener    
Net Sales 24,607,863 28,989,667
Depreciation and Amortization 1,182,555 1,217,174
Segment operating profit 1,531,933 1,762,835
Selling and Administrative Expenses 0 0
Other Income 0 0
Capital expenditures 614,835 1,522,541
Accounts receivable, net 4,906,239 4,313,185
Inventories, net 4,024,138 3,985,883
Property, plant and equipment, net 10,479,720 11,047,439
Other assets 0 0
Assembly Equipment    
Net Sales 2,982,790 3,883,335
Depreciation and Amortization 131,826 126,430
Segment operating profit 513,250 1,083,548
Selling and Administrative Expenses 0 0
Other Income 0 0
Capital expenditures 13,924 233,697
Accounts receivable, net 257,211 296,129
Inventories, net 1,129,156 965,294
Property, plant and equipment, net 1,568,862 1,686,764
Other assets 0 0
Unallocated Corporate    
Net Sales 0 0
Depreciation and Amortization 32,924 38,631
Segment operating profit 0 0
Selling and Administrative Expenses (2,128,197) (2,354,799)
Other Income 148,464 191,730
Capital expenditures 195,377 46,676
Accounts receivable, net 0 0
Inventories, net 0 0
Property, plant and equipment, net 1,102,302 939,850
Other assets $ 7,770,443 $ 8,488,832