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Short-Term Investments (Tables)
 12 Months Ended
Dec. 31, 2021
Investments Debt And Equity Securities [Abstract]  
Summary of Short-Term Investments by Significant Investment Category

The Company’s short-term investments by significant investment category as of December 31, 2021, are as follows: 

 

Description

 

Amortized Cost

 

 

Gross

Unrealized

Gains

 

 

Gross

Unrealized

Losses

 

 

Accrued

Interest

 

 

Estimated

Fair Value

 

Level 1: (1)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cash alternatives

 

$

2,172,853

 

 

$

-

 

 

$

-

 

 

$

-

 

 

$

2,172,853

 

Certificates of deposit

 

 

591,968

 

 

 

-

 

 

 

3,294

 

 

 

1,222

 

 

 

589,896

 

Corporate bonds and notes

 

 

4,293,722

 

 

 

-

 

 

 

5,432

 

 

 

46,820

 

 

 

4,335,110

 

Municipal Securities

 

 

7,411,043

 

 

 

-

 

 

 

2,334

 

 

 

29,182

 

 

 

7,437,891

 

 

 

$

14,469,586

 

 

$

-

 

 

$

11,060

 

 

$

77,224

 

 

$

14,535,750

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1)

Level 1 fair value estimates are based on quoted prices in active markets for identical assets or liabilities.