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Note 8 - Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2021
Notes Tables |
Debt Securities, Available-for-sale [Table Text Block] |
|  | December 31, 2021 |
(in thousands) |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
U.S. government agency securities |  | $ | 2,500 |  |  | $ | - |  |  | $ | (12 | ) |  | $ | 2,488 |
Corporate debt securities |  |  | 9,303 |  |  |  | - |  |  |  | (44 | ) |  |  | 9,259 |
U.S. municipal securities |  |  | 12,549 |  |  |  | - |  |  |  | (70 | ) |  |  | 12,479 |
Commercial paper |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Certificates of deposit/time deposits |  |  | 1,687 |  |  |  | 7 |  |  |  | - |  |  |  | 1,694 |
Total marketable securities |  | $ | 26,039 |  |  | $ | 7 |  |  | $ | (126 | ) |  | $ | 25,920 |
Debt Securities, Held-to-maturity [Table Text Block] |
|  | December 31, 2020 |
(in thousands) |  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Fair Value |
U.S. government agency securities |  | $ | 18,500 |  |  | $ | 6 |  |  | $ | (10 | ) |  | $ | 18,496 |
Corporate debt securities |  |  | 42,048 |  |  |  | 211 |  |  |  | (11 | ) |  |  | 42,248 |
U.S. municipal securities |  |  | 25,003 |  |  |  | 83 |  |  |  | (2 | ) |  |  | 25,084 |
Commercial paper |  |  | 2,499 |  |  |  | - |  |  |  | - |  |  |  | 2,499 |
Certificates of deposit/time deposits |  |  | 5,395 |  |  |  | 93 |  |  |  | - |  |  |  | 5,488 |
Total marketable securities |  | $ | 93,445 |  |  | $ | 393 |  |  | $ | (23 | ) |  | $ | 93,815 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | December 31, |
(in thousands) |  | 2021 |
Due in one year or less |  | $ | 11,580 |
Due after one year through five years |  |  | 14,340 |
Total marketable securities |  | $ | 25,920 |

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