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Note 4 - Short-term Investments (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Debt Securities, Held-to-Maturity [Table Text Block] |
|  | 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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