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Note 5 - Marketable Securities | 12 Months Ended
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Dec. 31, 2022
Notes to Financial Statements |
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] |
5. | MARKETABLE SECURITIES
The amortized cost, unrealized gain (loss), and estimated fair value of the Company's investments in securities available for sale consisted of the following:
|  | 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 |
The Company had seven separate marketable securities in an unrealized loss position as of December 31, 2022 and the Company held no marketable securities in 2021. The Company did not identify any marketable securities that were other-than-temporarily impaired as of December 31, 2022 and 2021. The Company does not intend to sell any marketable securities that have an unrealized loss at December 31, 2022 and it is not more likely than not that the Company will be required to sell such securities before any anticipated recovery. The following table summarizes the stated maturities of the Company’s marketable securities:
|  | 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 The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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