Revenue: Disaggregation of Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue	$ 8,621,678	$ 10,011,641
United States
Revenue	7,537,648	8,722,516
Foreign
Revenue	1,084,030	1,289,125
Automotive
Revenue	4,759,981	6,098,556
Nonautomotive
Revenue	3,861,697	3,913,085
Fastener
Revenue	7,579,120	8,925,099
Fastener | United States
Revenue	6,581,338	7,681,647
Fastener | Foreign
Revenue	997,782	1,243,452
Fastener | Automotive
Revenue	4,718,215	6,049,194
Fastener | Nonautomotive
Revenue	2,860,905	2,875,905
Assembly Equipment
Revenue	1,042,558	1,086,542
Assembly Equipment | United States
Revenue	956,310	1,040,869
Assembly Equipment | Foreign
Revenue	86,248	45,673
Assembly Equipment | Automotive
Revenue	41,766	49,362
Assembly Equipment | Nonautomotive
Revenue	$ 1,000,792	$ 1,037,180