Note 4 - Revenue and Segment Information - Capital Expenditures (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Capital expenditures		$ 168	$ 0	$ 336	$ 0
Refinery Operations [Member] | Operating Segments [Member]
Capital expenditures	[1]	$ 168	$ 0	$ 336	$ 0

[1] The $0.1 million capital expenditure was vendor financed.