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Investments - Available-for-Sale
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Investments - Available-for-Sale
Investments - Available-for-Sale
Investments available-for-sale consisted of the following as of December 31, 2019 and 2018:
 
December 31, 2019
 
Amortized Cost
 
Unrealized Gain
 
Unrealized Loss
 
Fair Value
Available-for-Sale Securities
 
 
 
 
 
 
 
Bonds
$
14,238,161

 
$
13,321

 
$
(1,306
)
 
$
14,250,176

 
December 31, 2018
 
Amortized Cost
 
Unrealized Gain
 
Unrealized Loss
 
Fair Value
Available-for-Sale Securities
 
 
 
 
 
 
 
Bonds
$
10,801,836

 
$
17,415

 
$
(1,192
)
 
$
10,818,059


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 Level 1, as described in Note 3, Fair Value Measurement to our consolidated financial statements.
As of December 31, 2019 and 2018, the amortized cost and estimated fair value of our available-for-sale securities were due in one year or less.