Note 7 - Revenue and Accounts Receivable - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Revenues	$ 62,700	$ 52,243	$ 117,319	$ 95,129
California Ethanol [Member]
Revenues	46,380	37,288	82,611	75,036
Revenues	52,865	37,288	91,691	75,036
California Ethanol [Member] \| Ethanol Sales [Member]
Revenues	34,037	27,724	61,160	55,783
California Ethanol [Member] \| Wet Distillers Grains [Member]
Revenues	9,720	7,828	17,400	15,828
California Ethanol [Member] \| Product and Service, Other [Member]
Revenues	2,623	1,736	4,051	3,425
California Ethanol [Member] \| Petroleum Tax Credits PTC [Member]
Revenues	6,485	0	9,080	0
California Dairy Renewable Natural Gas [Member]
Revenues	5,239	3,051	9,050	5,494
Revenues	7,325	3,051	12,579	5,494
California Dairy Renewable Natural Gas [Member] \| Gas Sales [Member]
Revenues	222	292	439	551
California Dairy Renewable Natural Gas [Member] \| LCFS Credit Sales [Member]
Revenues	1,807	773	3,470	1,933
California Dairy Renewable Natural Gas [Member] \| RIN Sales [Member]
Revenues	3,210	1,986	5,141	3,010
California Dairy Renewable Natural Gas [Member] \| PTC [Member]
Revenues	$ 2,086	$ 0	$ 3,529	$ 0