SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reclassifications, A/R, Inventories, Property and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Restricted Cash
Outstanding letters of credit	$ 0
Restricted Cash	305,683	$ 0
Accounts Receivable and Allowance for Doubtful Accounts
Accounts Receivable Allowances	209,000	883,000
Inventories
Raw materials	13,870,006	14,533,690
Work in process	3,112,407	4,104,968
Finished goods	2,388,496	2,688,596
Reserves	(844,187)	(673,413)
Total	18,526,722	20,653,841
Property and Equipment
Accumulated Depreciation	(26,312,628)	(24,524,750)
Total Property and Equipment, net	10,175,533	10,330,834
Land
Property and Equipment
Property and equipment	359,500	375,000
Building and Leasehold Improvements
Property and Equipment
Property and equipment	$ 8,826,802	9,393,092
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	$ 21,267,133	19,632,033
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	$ 6,034,726	$ 5,455,459
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