Revenue: Disaggregation of Revenue (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue	$ 8,875,451	$ 9,792,784	$ 17,497,129	$ 19,804,425
United States
Revenue	7,564,675	8,328,291	15,102,323	17,050,806
Foreign
Revenue	1,310,776	1,464,493	2,394,806	2,753,619
Automotive
Revenue	4,943,688	5,884,416	9,703,669	12,002,489
Nonautomotive
Revenue	3,931,763	3,908,368	7,793,460	7,801,936
Fastener
Revenue	7,816,704	9,034,275	15,395,824	17,959,374
Fastener \| United States
Revenue	6,612,996	7,617,546	13,194,334	15,299,192
Fastener \| Foreign
Revenue	1,203,708	1,416,729	2,201,490	2,660,182
Fastener \| Automotive
Revenue	4,880,038	5,845,574	9,598,254	11,913,584
Fastener \| Nonautomotive
Revenue	2,936,666	3,188,701	5,797,570	6,045,790
Assembly Equipment
Revenue	1,058,747	758,509	2,101,305	1,845,051
Assembly Equipment \| United States
Revenue	951,679	710,745	1,907,989	1,751,614
Assembly Equipment \| Foreign
Revenue	107,068	47,764	193,316	93,437
Assembly Equipment \| Automotive
Revenue	63,650	38,842	105,415	88,905
Assembly Equipment \| Nonautomotive
Revenue	$ 995,097	$ 719,667	$ 1,995,890	$ 1,756,146