Note 7 - Revenue and Accounts Receivable - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Revenues	$ 88,153	$ 59,190	$ 205,472	$ 154,319
California Ethanol [Member]
Revenues	49,169	40,726	131,779	115,762
Revenues	53,804	40,726	145,495	115,762
California Ethanol [Member] \| Ethanol Sales [Member]
Revenues	36,573	31,252	97,732	87,035
California Ethanol [Member] \| Wet Distillers Grains [Member]
Revenues	9,064	7,305	26,464	23,133
California Ethanol [Member] \| Product and Service, Other [Member]
Revenues	3,532	2,169	7,583	5,594
California Ethanol [Member] \| Petroleum Tax Credits PTC [Member]
Revenues	4,635	0	13,716	0
California Dairy Renewable Natural Gas [Member]
Revenues	5,872	3,996	14,922	9,490
Revenues	25,923	3,996	38,502	9,490
California Dairy Renewable Natural Gas [Member] \| Gas Sales [Member]
Revenues	499	393	938	944
California Dairy Renewable Natural Gas [Member] \| LCFS Credit Sales [Member]
Revenues	2,016	1,187	5,486	3,120
California Dairy Renewable Natural Gas [Member] \| RIN Sales [Member]
Revenues	3,357	2,416	8,498	5,426
California Dairy Renewable Natural Gas [Member] \| PTC [Member]
Revenues	$ 20,051	$ 0	$ 23,580	$ 0