Note 1 - Organization and Accounting Policies - Analysis of Change in Allowance for Bad Debt (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2022 |
Sep. 30, 2021 |
Sep. 30, 2022 |
Sep. 30, 2021 |
|
| Balance at beginning of period | $ (6,389) | $ (5,575) | $ (5,741) | $ (2,273) |
| Bad debt charge, net of receipts | (1,020) | (318) | (2,083) | (814) |
| Adjustment associated with Sasol Acquisition | 0 | 0 | 0 | (2,879) |
| Foreign currency gain (loss) | 355 | 117 | 770 | 190 |
| Balance at end of period | $ (7,054) | $ (5,776) | $ (7,054) | $ (5,776) |
| 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 expense (reversal of expense) for expected credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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