Investments (Tables)

9 Months Ended

Sep. 30, 2018

Investments, Debt and Equity Securities [Abstract]

Held-to-maturity Securities [Table Text Block]

The following tables summarizes the Company’s held-to-maturity investment securities at amortized cost as of September 30, 2018 and December 31, 2017:

	September 30, 2018
	Amortized Cost, as Adjusted		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
Short-term investments:
Certificates of Deposit	$	9,902,512	$	-	$	5,483	$	9,897,029
Governmental Agency Securities		7,551,052		-		37,815		7,513,237
U.S. Treasury Notes		1,496,360		1,237		-		1,497,597
Total	$	18,949,924	$	1,237	$	43,298	$	18,907,863

	Amortized Cost, as Adjusted		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
Long-term investments:
Certificates of Deposit	$	3,920,000	$	-	$	36,722	$	3,883,278
Total	$	3,920,000	$	-	$	36,722	$	3,883,278

	December 31, 2017
	Amortized Cost, as Adjusted		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
Short-term investments:
Certificates of Deposit	$	14,001,237	$	-	$	20,146	$	13,981,091
Governmental Agency Securities		5,945,314		-		18,101		5,927,213
U.S. Treasury Notes		1,610,306		-		633		1,609,673
Total	$	21,556,857	$	-	$	38,880	$	21,517,977

	Amortized Cost, as Adjusted		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses		Estimated Fair Value
Long-term investments:
Certificates of Deposit	$	4,165,000	$	-	$	21,481	$	4,143,519
Governmental Agency Securities		3,040,374		-		14,907		3,025,467
Total	$	7,205,374	$	-	$	36,388	$	7,168,986