Summary of Significant Accounting Policies, Fair Value of Financial Instruments Through Inventories (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2017 Segment	Dec. 31, 2017 USD ($) Segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting [Abstract]
Number of operating segments | Segment	1	3
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Adjusted Cost		$ 27,160,883	$ 28,308,034
Unrealized Gains		0	2,285
Unrealized Losses		(4,013)	(23,633)
Fair Value		27,156,870	28,286,685
Cash and Cash Equivalents		20,909,605	9,369,624
Short-Term Investments		6,247,265	13,573,057
Long-Term Investments		0	5,344,004
Cash, Cash Equivalents and Marketable Securities [Abstract]
Cash and cash equivalents		20,909,605	9,369,624	$ 1,976,594
Cash and cash equivalents held in foreign bank accounts		879,000	507,000
Accounts Receivable [Abstract]
Allowance for doubtful accounts		87,000	34,000
Inventories [Abstract]
Raw materials		3,449,000	4,483,000
Work-in-process		322,000	462,000
Finished goods		3,406,000	2,290,000
Inventories		$ 7,176,695	7,235,043
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		20.00%
Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest		50.00%
Cash [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Adjusted Cost		$ 4,318,229	3,773,790
Unrealized Gains		0	0
Unrealized Losses		0	0
Fair Value		4,318,229	3,773,790
Cash and Cash Equivalents		4,318,229	3,773,790
Short-Term Investments		0	0
Long-Term Investments		0	0
Level 1 [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Adjusted Cost		16,591,376	3,197,958
Unrealized Gains		0	0
Unrealized Losses		0	0
Fair Value		16,591,376	3,197,958
Cash and Cash Equivalents		16,591,376	3,197,958
Short-Term Investments		0	0
Long-Term Investments		0	0
Level 1 [Member] | Money Market Funds [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Adjusted Cost		16,591,376	3,197,958
Unrealized Gains		0	0
Unrealized Losses		0	0
Fair Value		16,591,376	3,197,958
Cash and Cash Equivalents		16,591,376	3,197,958
Short-Term Investments		0	0
Long-Term Investments		0	0
Level 2 [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Adjusted Cost		6,251,278	21,336,285
Unrealized Gains		0	2,285
Unrealized Losses		(4,013)	(23,633)
Fair Value		6,247,265	21,314,937
Cash and Cash Equivalents		0	2,397,876
Short-Term Investments		6,247,265	13,573,057
Long-Term Investments		0	5,344,004
Level 2 [Member] | Certificates of Deposit [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Adjusted Cost		1,440,000	2,160,010
Unrealized Gains		0	2,285
Unrealized Losses		(1,783)	0
Fair Value		1,438,217	2,162,295
Cash and Cash Equivalents		0	0
Short-Term Investments		1,438,217	720,031
Long-Term Investments		0	1,442,264
Level 2 [Member] | Commercial Paper [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Adjusted Cost		1,198,574	5,984,110
Unrealized Gains		0	0
Unrealized Losses		(362)	(4,100)
Fair Value		1,198,212	5,980,010
Cash and Cash Equivalents		0	2,397,876
Short-Term Investments		1,198,212	3,582,134
Long-Term Investments		0	0
Level 2 [Member] | Corporate Notes/Bonds [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Adjusted Cost		3,612,704	9,688,957
Unrealized Gains		0	0
Unrealized Losses		(1,868)	(13,885)
Fair Value		3,610,836	9,675,072
Cash and Cash Equivalents		0	0
Short-Term Investments		3,610,836	7,273,992
Long-Term Investments		0	2,401,080
Level 2 [Member] | U.S. Government Agencies [Member]
Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract]
Adjusted Cost		0	3,503,208
Unrealized Gains		0	0
Unrealized Losses		0	(5,648)
Fair Value		0	3,497,560
Cash and Cash Equivalents		0	0
Short-Term Investments		0	1,996,900
Long-Term Investments		$ 0	$ 1,500,660