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Marketable Investment Securities (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 4,880,615	$ 7,174,000
Gross unrealized holding gains	261	0
Gross unrealized holding losses	0	(963)
Aggregate fair value	4,880,876	7,173,037
Government bonds and notes [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	849,887	897,481
Gross unrealized holding gains	36	0
Gross unrealized holding losses	0	(100)
Aggregate fair value	849,923	897,381
Corporate Bonds, Notes and Commercial Paper [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,030,728	6,276,519
Gross unrealized holding gains	225	0
Gross unrealized holding losses	0	(863)
Aggregate fair value	$ 4,030,953	$ 6,275,656

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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