Revenue: Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue	$ 8,188,905	$ 8,856,049	$ 25,686,034	$ 28,660,474
United States
Revenue	7,075,247	7,782,620	22,175,060	25,267,476
Foreign
Revenue	1,113,658	1,073,429	3,510,974	3,392,998
Automotive
Revenue	4,759,596	5,391,784	14,463,265	17,415,131
Nonautomotive
Revenue	3,429,309	3,464,265	11,222,769	11,245,343
Fastener
Revenue	7,306,895	7,936,798	22,702,719	25,896,172
Fastener | United States
Revenue	6,252,110	6,926,372	19,443,934	22,659,279
Fastener | Foreign
Revenue	1,054,785	1,010,426	3,258,785	3,236,893
Fastener | Automotive
Revenue	4,698,298	5,291,033	14,296,552	17,225,475
Fastener | Nonautomotive
Revenue	2,608,597	2,645,765	8,406,167	8,670,697
Assembly Equipment
Revenue	882,010	919,251	2,983,315	2,764,302
Assembly Equipment | United States
Revenue	823,137	856,248	2,731,126	2,608,197
Assembly Equipment | Foreign
Revenue	58,873	63,003	252,189	156,105
Assembly Equipment | Automotive
Revenue	61,298	100,751	166,713	189,656
Assembly Equipment | Nonautomotive
Revenue	$ 820,712	$ 818,500	$ 2,816,602	$ 2,574,646