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Investments - Available-for-Sale
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Investments - Available-for-Sale Investments - Available-for-Sale
Investments available-for-sale consisted of the following as of June 30, 2020 and December 31, 2019:
 
June 30, 2020
 
Amortized Cost
 
Unrealized Gain
 
Unrealized Loss
 
Accrued Interest Income
 
Fair Value
Available-for-Sale Securities
 
 
 
 
 
 
 
 
 
Bonds
$
13,172,049

 
$
14,468

 
$
(447
)
 
$
72,127

 
$
13,258,197

 
December 31, 2019
 
Amortized Cost
 
Unrealized Gain
 
Unrealized Loss
 
Accrued Interest
 
Fair Value
Available-for-Sale Securities
 
 
 
 
 
 
 
 
 
Bonds
$
14,238,161

 
$
13,321

 
$
(1,306
)
 
$
—

 
$
14,250,176


The fair value of investments available-for-sale are determined using quoted market prices from daily exchange-traded markets based on the closing price as of the balance sheet date and are classified as a Level 1 measurement under ASC 820 Fair Value Measurements.
As of June 30, 2020 and December 31, 2019, the amortized cost and estimated fair value of our available-for-sale securities were due within one year.