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Note 4 - Investments | 3 Months Ended
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Mar. 31, 2023
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:
|  | March 31, 2023 |
|  | Amortized |  |  | Gross unrealized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Available-for-sale securities, current portion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 9,386 |  |  | $ | - |  |  | $ | 9 |  |  | $ | 9,377 |
Corporate debt securities |  |  | 24,663 |  |  |  | 7 |  |  |  | 7 |  |  |  | 24,663 |
Other debt securities |  |  | 1,743 |  |  |  | - |  |  |  | 3 |  |  |  | 1,740 |
Total short-term |  |  | 35,792 |  |  |  | 7 |  |  |  | 19 |  |  |  | 35,780 |
Available-for-sale securities, long-term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other debt securities |  |  | 2,018 |  |  |  | 2 |  |  |  | 1 |  |  |  | 2,019 |
Total marketable securities |  | $ | 37,810 |  |  | $ | 9 |  |  | $ | 20 |  |  | $ | 37,799 |
|  | Amortized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 35,792 |  |  | $ | 35,780 |
Due after one year through five years |  |  | 2,018 |  |  |  | 2,019 |
Total |  | $ | 37,810 |  |  | $ | 37,799 |
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 for both the periods ending March 31, 2023 and December 31, 2022, respectively, and Series E Preferred Stock in PanTHERA CryoSolutions, Inc. with a fair value of $995,000 as of March 31, 2023 and December 31, 2022.

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