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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
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X
- Definition Amount of foreign currency gain (loss) on allowance for doubtful accounts. + References No definition available. + Details
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X
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