Segment Reporting: Schedule of Segment Reporting, by Segment (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Net sales	$ 8,188,905	$ 8,856,049	$ 25,686,034	$ 28,660,474
Depreciation			1,029,998	973,182
Accounts receivable - Less allowances of $140,000	5,614,022		5,614,022		$ 5,529,307
Inventories, net	5,476,333		5,476,333		6,100,391
Net property, plant and equipment	13,790,932		13,790,932		$ 13,258,146
Fastener
Net sales	7,306,895	7,936,798	22,702,719	25,896,172
Depreciation	305,082	281,418	907,887	865,677
Segment operating profit	605,503	599,188	1,681,703	3,006,367
Selling and administrative expenses	0	0	0	0
Interest income	0	0	0	0
Capital expenditures	267,179	813,649	1,307,859	1,279,568
Accounts receivable - Less allowances of $140,000	5,174,674	5,961,946	5,174,674	5,961,946
Inventories, net	4,294,760	4,226,263	4,294,760	4,226,263
Net property, plant and equipment	11,126,165	10,696,801	11,126,165	10,696,801
Other Assets	0	0	0	0
Assembly Equipment
Net sales	882,010	919,251	2,983,315	2,764,302
Depreciation	32,507	28,358	92,884	82,954
Segment operating profit	336,320	297,009	988,196	930,570
Selling and administrative expenses	0	0	0	0
Interest income	0	0	0	0
Capital expenditures	2,576	5,489	228,900	36,984
Accounts receivable - Less allowances of $140,000	439,348	540,428	439,348	540,428
Inventories, net	1,181,573	1,028,070	1,181,573	1,028,070
Net property, plant and equipment	1,715,513	1,596,585	1,715,513	1,596,585
Other Assets	0	0	0	0
Unallocated Corporate
Net sales	0	0	0	0
Depreciation	9,742	9,869	29,227	24,551
Segment operating profit	0	0	0	0
Selling and administrative expenses	(563,705)	(563,347)	(1,705,159)	(1,831,926)
Interest income	36,679	30,899	108,458	84,618
Capital expenditures	0	187,598	26,025	325,902
Accounts receivable - Less allowances of $140,000	0	0	0	0
Inventories, net	0	0	0	0
Net property, plant and equipment	949,254	932,839	949,254	932,839
Other Assets	$ 8,195,043	$ 8,446,731	$ 8,195,043	$ 8,446,731