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Note 4 - Investments | 12 Months Ended
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Dec. 31, 2022
Notes to Financial Statements |
Investment [Text Block] |
4. | Investments
Available-for-sale securities The Company’s portfolio of available-for-sale marketable securities consists of the following:
|  | December 31, 2022 |
|  | Amortized |  |  | Gross unrealized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Available-for-sale securities, current portion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 15,087 |  |  | $ | 1 |  |  | $ | 37 |  |  | $ | 15,051 |
Corporate debt securities |  |  | 26,057 |  |  |  | 6 |  |  |  | 16 |  |  |  | 26,047 |
Other debt securities |  |  | 2,169 |  |  |  | - |  |  |  | 7 |  |  |  | 2,162 |
Total short-term |  |  | 43,313 |  |  |  | 7 |  |  |  | 60 |  |  |  | 43,260 |
Available-for-sale securities, long-term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other debt securities |  |  | 1,329 |  |  |  | 3 |  |  |  | - |  |  |  | 1,332 |
Total marketable securities |  | $ | 44,642 |  |  | $ | 10 |  |  | $ | 60 |  |  | $ | 44,592 |
|  | Amortized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 43,313 |  |  | $ | 43,260 |
Due after one year through five years |  |  | 1,329 |  |  |  | 1,332 |
Total |  | $ | 44,642 |  |  | $ | 44,592 |
There were no outstanding available-for-sale marketable securities as of December 31, 2021. Equity investments The Company periodically invests in non-marketable equity securities of private companies without a readily determinable fair value to promote business and strategic objectives. These securities included Series A-1 and A-2 Preferred Stock in iVexSol, Inc. with a fair value of $4.1 million and $3.4 million as of December 31, 2022 and December 31, 2021, respectively, and Series E Preferred Stock in PanTHERA CryoSolutions, Inc. with a fair value of $995,000 as of December 31, 2022 and December 31, 2021.

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