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Note 5 - Transactions With Affiliated Companies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Investment, Affiliated Issuer, Noncontrolled [Member] |  |
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease) |  | $ 0
Investment, Affiliated Issuer, Controlled [Member] |  |
Investments in and Advances to Affiliates, at Fair Value, Period Increase (Decrease) | $ 0 |

X
- Definition Amount of increase (decrease) in the investments in and advances to affiliates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 1)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480032/946-320-S99-6 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |