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Note 10 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Proceeds from Sale of Debt Securities, Available-for-Sale |  | $ 702 | $ 0 |
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment and Tax | $ 100 | 200 |  |
Debt Security, Corporate, Non-US [Member] |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 8.75%
PEMEX [Member] |  |  |  |
Accounts Receivable, before Allowance for Credit Loss, Current | 7,800 | $ 7,800 |  | $ 8,600
Debt Securities, Available-for-Sale, Sold at Par Value | 700 |  |  |
Proceeds from Sale of Debt Securities, Available-for-Sale | $ 700 |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
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