Quarterly Results Of Operations (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
QUARTERLY RESULTS OF OPERATIONS
Sales	$ 14,838,016	$ 14,626,904	$ 13,243,107	$ 14,592,254	$ 13,389,786	$ 12,814,815	$ 13,452,517	$ 13,627,048	$ 57,300,281	$ 53,284,166	$ 55,350,702
Cost of Sales	16,062,936	13,555,853	11,744,819	12,234,782	11,401,603	11,234,934	11,962,989	11,932,122	53,598,390	46,531,648	46,412,848
Gross Profit	(1,224,920)	1,071,051	1,498,288	2,357,472	1,988,183	1,579,881	1,489,528	1,694,926	3,701,891	6,752,518	8,937,854
Selling, General and Administrative	5,869,879	4,791,636	6,541,179	6,100,715	6,049,663	5,070,127	5,014,370	4,986,741	23,303,409	21,120,901	19,078,867
Research and Product Development	2,126,397	1,304,658	1,675,494	1,214,851	1,200,729	1,261,863	2,063,324	1,314,430	6,321,400	5,840,346	4,961,313
Operating Income (Loss)	(9,221,196)	(5,025,243)	(6,718,385)	(4,958,094)	(5,262,209)	(4,752,109)	(5,588,166)	(4,606,245)	(25,922,918)	(20,208,729)	(15,102,326)
Interest and Investment Income, net	181,171	(31,751)	(364,599)	216,071	207,911	188,847	227,020	186,562	892	810,340	681,876
Foreign Currency Gain (Loss)	742								742
Income (Loss) Before Income Taxes	(9,039,283)	(5,056,994)	(7,082,984)	(4,742,023)	(5,054,298)	(4,563,262)	(5,361,146)	(4,419,683)	(25,921,284)	(19,398,389)	(14,420,450)
Income Tax Expense								404,527	0	404,527	0	$ 0
Net Income (Loss)	$ (9,039,283)	$ (5,056,994)	$ (7,082,984)	$ (4,742,023)	$ (5,054,298)	$ (4,563,262)	$ (5,361,146)	$ (4,824,210)	$ (25,921,284)	$ (19,802,916)	$ (14,420,450)
Basic And Diluted Earnings (Loss) Per Share (in dollars per share)	$ (0.18)	$ (0.10)	$ (0.14)	$ (0.09)	$ (0.10)	$ (0.09)	$ (0.11)	$ (0.10)