Nature of Business and Summary of Significant Accounting Policies - A/R, Inventories, Property and Equipment (Details) - USD ($)	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Accounts Receivable and Allowance for Doubtful Accounts
Accounts Receivable Allowance	$ 883,000	$ 320,000
Inventories
Raw Materials	14,533,690	13,782,411
Work in Process	4,104,968	4,674,223
Finished Goods	2,688,596	2,478,423
Reserves	(673,413)	(749,612)
Total	20,653,841	20,185,445
Property and Equipment
Accumulated Depreciation	(24,524,750)	(22,712,738)
Total Property and Equipment, net	10,330,834	10,507,748
Land
Property and Equipment
Property and equipment	375,000	375,000
Building and Leasehold Improvements
Property and Equipment
Property and equipment	$ 9,393,092	9,273,866
Buildings
Property and Equipment
Estimated useful lives	39 years
Leasehold improvements \| Minimum
Property and Equipment
Estimated useful lives	3 years
Leasehold improvements \| Maximum
Property and Equipment
Estimated useful lives	15 years
Manufacturing equipment
Property and Equipment
Property and equipment	$ 19,632,033	18,588,934
Manufacturing equipment \| Minimum
Property and Equipment
Estimated useful lives	3 years
Manufacturing equipment \| Maximum
Property and Equipment
Estimated useful lives	7 years
Office and other equipment
Property and Equipment
Property and equipment	$ 5,455,459	$ 4,982,686
Office and other equipment \| Minimum
Property and Equipment
Estimated useful lives	3 years
Office and other equipment \| Maximum
Property and Equipment
Estimated useful lives	7 years

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