Nature of Business and Summary of Significant Accounting Policies - Enterprise Wide Disclosures and Foreign Currency Transactions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Enterprise-Wide Disclosures
Percentage of sales (as a percent)	10.00%
Total Net Sales	$ 116,621,719	$ 115,191,905
Property and equipment, net	10,330,834	10,507,748
Other assets	5,152,944	5,343,600
Foreign Currency Transactions
Foreign currency translation adjustment	19,000
Foreign currency translation loss	44,000	63,000
Net foreign currency transaction gains (losses)	(82,000)	(15,000)
United States
Enterprise-Wide Disclosures
Property and equipment, net	8,731,205	9,322,484
Other assets	5,145,218	5,335,874
Mexico
Enterprise-Wide Disclosures
Property and equipment, net	1,238,087	1,185,264
Other assets	7,726	$ 7,726
China
Enterprise-Wide Disclosures
Property and equipment, net	$ 361,542
Export sales | Domestic
Enterprise-Wide Disclosures
Percentage of sales (as a percent)	8.00%	13.00%
Aerospace and Defense
Enterprise-Wide Disclosures
Total Net Sales	$ 16,115,000	$ 14,458,000
Medical
Enterprise-Wide Disclosures
Total Net Sales	53,836,000	41,308,000
Industrial
Enterprise-Wide Disclosures
Total Net Sales	$ 46,671,000	$ 59,426,000