Note 11 - Selected Quarterly Information (Unaudited) - Schedule of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Oil and gas sales	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Net Income (Loss) Attributable to Parent	$ (1,746)	$ (1,791)	$ (2,054)	$ (1,752)	$ (1,741)	$ (1,743)	$ (2,334)	$ (2,139)	$ (7,343)	$ (7,957)
Net (loss) gain per share – basic and diluted (in dollars per share)	$ (0.002)	$ (0.002)	$ (0.003)	$ (0.003)	$ (0.003)	$ (0.003)	$ (0.004)	$ (0.004)	$ (0.01)	$ (0.01)
Weighted-average shares outstanding–basic and diluted (in thousands) (in shares)	931,449	843,211	745,565	667,023	618,233	578,497	542,812	531,023	797,267	568,351