Note 2 - Summary of Significant Accounting Policies - Analysis of Change in Allowance for Bad Debt (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Balance at beginning of period | $ (5,741) | $ (2,273) | $ (1,508) |
| Bad debt charges, net of receipts | (3,082) | (875) | (1,165) |
| Adjustment associated with reversal of allowance on Mutamba receivable | 0 | 0 | 593 |
| Adjustment associated with Sasol Acquisition | 0 | (2,879) | 0 |
| Foreign currency gain (loss) | 119 | 286 | (193) |
| Balance at end of period | $ (8,704) | $ (5,741) | $ (2,273) |
| X | ||||||||||
- Definition Amount of adjustment from business acquisition to allowance for doubtful accounts. No definition available.
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| X | ||||||||||
- Definition Amount of foreign currency gain (loss) on allowance for doubtful accounts. No definition available.
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| X | ||||||||||
- Definition Amount of allowance for credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of direct write-downs of accounts receivable charged against the allowance. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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