Revenue: Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue	$ 7,645,259	$ 8,188,905	$ 19,325,234	$ 25,686,034
United States
Revenue	6,513,614	7,075,247	16,612,812	22,175,060
Foreign
Revenue	1,131,645	1,113,658	2,712,422	3,510,874
Automotive
Revenue	4,695,138	4,759,596	10,761,097	14,463,265
Nonautomotive
Revenue	2,950,121	3,429,309	8,564,137	11,222,769
Fastener
Revenue	7,024,416	7,306,895	17,275,555	22,702,719
Fastener | United States
Revenue	5,909,756	6,252,110	14,721,327	19,443,934
Fastener | Foreign
Revenue	1,114,660	1,054,785	2,554,228	3,258,785
Fastener | Automotive
Revenue	4,660,451	4,698,298	10,653,621	14,296,552
Fastener | Nonautomotive
Revenue	2,363,965	2,608,597	6,621,934	8,406,167
Assembly Equipment
Revenue	620,843	882,010	2,049,679	2,983,315
Assembly Equipment | United States
Revenue	603,858	823,137	1,891,485	2,731,126
Assembly Equipment | Foreign
Revenue	16,985	58,873	158,194	252,189
Assembly Equipment | Automotive
Revenue	34,687	61,298	107,476	166,713
Assembly Equipment | Nonautomotive
Revenue	$ 586,156	$ 820,712	$ 1,942,203	$ 2,816,602