Note 1 - Organization and Accounting Policies - Analysis of Change in Allowance for Bad Debt (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2022 |
Jun. 30, 2021 |
Jun. 30, 2022 |
Jun. 30, 2021 |
|
| Balance at beginning of period | $ (6,135) | $ (5,092) | $ (5,741) | $ (2,273) |
| Bad debt charge, net of receipts | (571) | (395) | (1,063) | (496) |
| Adjustment associated with Sasol Acquisition | 0 | 0 | 0 | (2,879) |
| Foreign currency gain (loss) | 317 | (88) | 415 | 73 |
| Balance at end of period | $ (6,389) | $ (5,575) | $ (6,389) | $ (5,575) |
| 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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