Revenue: Disaggregation of Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue	$ 7,576,455	$ 8,621,678
United States
Revenue	6,489,411	7,537,648
Foreign
Revenue	1,087,044	1,084,030
Automotive
Revenue	4,447,196	4,759,981
Nonautomotive
Revenue	3,129,259	3,861,697
Fastener
Revenue	6,737,397	7,579,120
Fastener | United States
Revenue	5,740,925	6,581,338
Fastener | Foreign
Revenue	996,472	997,782
Fastener | Automotive
Revenue	4,413,737	4,718,215
Fastener | Nonautomotive
Revenue	2,323,660	2,860,905
Assembly Equipment
Revenue	839,058	1,042,558
Assembly Equipment | United States
Revenue	748,486	956,310
Assembly Equipment | Foreign
Revenue	90,572	86,248
Assembly Equipment | Automotive
Revenue	33,459	41,766
Assembly Equipment | Nonautomotive
Revenue	$ 805,599	$ 1,000,792