| Schedule of fair value of assets and liabilities measured on a recurring basis |
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Fair Value Measurement Using: |
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Cost / Other |
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Quoted Prices in Active Markets for Identical Assets |
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Significant Other Observable Inputs |
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Significant Unobservable Inputs |
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Accumulated Unrealized Gains and |
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Fair Value |
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Value |
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(Level 1) |
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(Level 2) |
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(Level 3) |
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(Losses) |
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| Certificates of deposit |
|
$ |
11,432,214 |
|
|
$ |
11,443,068 |
|
|
$ |
— |
|
|
$ |
11,432,214 |
|
|
$ |
— |
|
|
$ |
(10,854 |
) |
| U.S. Treasuries |
|
|
8,800,721 |
|
|
|
8,814,820 |
|
|
|
— |
|
|
|
8,800,721 |
|
|
|
— |
|
|
|
(14,099 |
) |
| Subtotal |
|
$ |
20,232,935 |
|
|
$ |
20,257,888 |
|
|
$ |
— |
|
|
$ |
20,232,935 |
|
|
$ |
— |
|
|
$ |
(24,953 |
) |
| Long-term investments |
|
|
1,430,177 |
|
|
|
1,431,712 |
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|
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— |
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1,430,177 |
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|
|
|
|
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(1,535 |
) |
| Total |
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$ |
21,663,112 |
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|
$ |
21,689,600 |
|
|
$ |
— |
|
|
$ |
21,663,112 |
|
|
$ |
— |
|
|
$ |
(26,488 |
) |
|