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Note 2 - Summary of Significant Accounting Policies - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets, Fair Value Disclosure | $ 403 | $ 102
Liabilities, Fair Value Disclosure | 163 | 556
Prepayments and Other [Member] |  |
Derivative asset | 403 | 102
Accrued Liabilities and Other [Member] |  |
SARs liability | 163 | 556
Derivative liability | 0 |
Fair Value, Inputs, Level 1 [Member] |  |
Assets, Fair Value Disclosure | 0 | 0
Liabilities, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Prepayments and Other [Member] |  |
Derivative asset | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Accrued Liabilities and Other [Member] |  |
SARs liability | 0 | 0
Derivative liability | 0 |
Fair Value, Inputs, Level 2 [Member] |  |
Assets, Fair Value Disclosure | 403 | 102
Liabilities, Fair Value Disclosure | 163 | 556
Fair Value, Inputs, Level 2 [Member] | Prepayments and Other [Member] |  |
Derivative asset | 403 | 102
Fair Value, Inputs, Level 2 [Member] | Accrued Liabilities and Other [Member] |  |
SARs liability | 163 | 556
Derivative liability | 0 |
Fair Value, Inputs, Level 3 [Member] |  |
Assets, Fair Value Disclosure | 0 | 0
Liabilities, Fair Value Disclosure | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Prepayments and Other [Member] |  |
Derivative asset | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Accrued Liabilities and Other [Member] |  |
SARs liability | 0 | $ 0
Derivative liability | $ 0 |

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