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Note 5 - Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Marketable Securities [Table Text Block] |
|  | December 31, 2022 |
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate and municipal debt securities |  | $ | 4,950 |  |  | $ | 26 |  |  | $ | (3 | ) |  | $ | 4,973 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | December 31, 2022 |  |  | December 31, 2021 |
(in thousands) |  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
Due within one year |  | $ | 1,594 |  |  | $ | 1,602 |  |  | $ | − |  |  | $ | − |
Due after one year through three years |  |  | 3,356 |  |  |  | 3,371 |  |  |  | − |  |  |  | − |
Total |  | $ | 4,950 |  |  | $ | 4,973 |  |  | $ | − |  |  | $ | − |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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