Note 2 - Government Tax Credits and Asset Grants (Details Textual) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
Mar. 31, 2011 |
|
| Small Agri-Biodiesel Producer Tax Credit | $ 1,490 | $ 1,845 | ||||
| Clean Fuel Production Credit | 3,724 | $ 2,483 | 4,888 | $ 2,483 | ||
| Transferrable Tax Credits | $ 2,725 | $ 2,725 | $ 2,654 | |||
| Building [Member] | ||||||
| Property, Plant, and Equipment, Useful Life (Year) | 33 years | |||||