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Note 3 - Investments | 6 Months Ended
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Jun. 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:
|  | June 30, 2022 |
|  | Amortized |  |  | Gross unrealized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Available-for-sale securities, current portion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government securities |  | $ | 10,361 |  |  | $ | - |  |  | $ | 26 |  |  | $ | 10,335 |
Corporate debt securities |  |  | 11,524 |  |  |  | - |  |  |  | 8 |  |  |  | 11,516 |
Other debt securities |  |  | 699 |  |  |  | - |  |  |  | 4 |  |  |  | 695 |
Total short-term |  |  | 22,584 |  |  |  | - |  |  |  | 38 |  |  |  | 22,546 |
Available-for-sale securities, long-term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other debt securities |  |  | 491 |  |  |  | - |  |  |  | 2 |  |  |  | 489 |
Total marketable securities |  | $ | 23,075 |  |  | $ | - |  |  | $ | 40 |  |  | $ | 23,035 |
There were no outstanding available-for-sale marketable securities as of December 31, 2021. The contractual maturities of our available-for-sale marketable securities as of June 30, 2022 are as follows:
|  | Amortized |  |  | Estimated |
(In thousands) |  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 22,584 |  |  | $ | 22,546 |
Due after one year through five years |  |  | 491 |  |  |  | 489 |
Total |  | $ | 23,075 |  |  | $ | 23,035 |
Equity investments We periodically invest in securities of private companies to promote business and strategic objectives. At June 30, 2022 and December 31, 2021, we held non-marketable equity securities without a readily determinable fair value, comprised of $3.4 million in Series A-1 and A-2 Preferred Stock in iVexSol, Inc. and $995,000 in Series E Preferred Stock in PanTHERA CryoSolutions, Inc.

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