Note 4 - Other Accrued Liabilities - Other Accrued Liabilities (Details) - USD ($)	Sep. 30, 2024	Dec. 31, 2023
Professional services	$ 254,000	$ 472,000
Operating costs	943,000	450,000
Other	769,000	304,000
Total other accrued liabilities	$ 1,966,000	$ 1,226,000