Note 6 - Variable Interest Entities (Details Textual) |
6 Months Ended |
|---|---|
Jun. 30, 2021 | |
| Rubicon LLC [Member] | |
| Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 50.00% |
| Arabian Amines Company [Member] | |
| Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage | 50.00% |
| X | ||||||||||
- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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