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Note 3 - Investments | 9 Months Ended
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Sep. 30, 2022
Notes to Financial Statements |
Investment [Text Block] | 3. Investments Available-for-sale securities The Company’s portfolio of available-for-sale marketable securities consists of the following:
|  | September 30, 2022 |
|  | Amortized |  |  | Gross unrealized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Available-for-sale securities, current portion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 13,102 |  |  | $ | - |  |  | $ | 48 |  |  | $ | 13,054 |
Corporate debt securities |  |  | 20,112 |  |  |  | - |  |  |  | 18 |  |  |  | 20,094 |
Other debt securities |  |  | 1,444 |  |  |  | - |  |  |  | 9 |  |  |  | 1,435 |
Total short-term |  |  | 34,658 |  |  |  | - |  |  |  | 75 |  |  |  | 34,583 |
Available-for-sale securities, long-term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other debt securities |  |  | 490 |  |  |  | - |  |  |  | - |  |  |  | 490 |
Total marketable securities |  | $ | 35,148 |  |  | $ | - |  |  | $ | 75 |  |  | $ | 35,073 |
|  | Amortized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 34,658 |  |  | $ | 34,583 |
Due after one year through five years |  |  | 490 |  |  |  | 490 |
Total |  | $ | 35,148 |  |  | $ | 35,073 |
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 September 30, 2022 and December 31, 2021, respectively, and Series E Preferred Stock in PanTHERA CryoSolutions, Inc. with a fair value of $995,000 as of September 30, 2022 and December 31, 2021.

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