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Note 4 - Short-term Investments | 6 Months Ended
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Jun. 30, 2022
Notes to Financial Statements |
Investment [Text Block] |
(4) | SHORT-TERM INVESTMENTS
Our short-term investments at June 30, 2022 consist of investments in U.S. treasury bills which were purchased in April 2022 and which have original maturities of six months. They are all classified as held-to-maturity. Additional information about these investments at June 30, 2022 is as follows:
|  | Amortized Cost Basis |  |  | Gross Unrealized Gains |  |  | Fair Value |
As of June 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury bills |  | $ | 3,485 |  |  | $ | - |  |  | $ | 3,485 |

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