Note 7 - Share-based Compensation - Share-based Compensation Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Research and development	$ 496	$ 2,063
SEED 2022 Share Incentive Plan [Member]
Research and development	225,000	192,000
Research and Development Expense [Member]
Research and development	106	63
Research and Development Expense [Member] | SEED 2022 Share Incentive Plan [Member]
Research and development	29,000	50,000
General and Administrative Expense [Member]
Research and development	390	2,000
General and Administrative Expense [Member] | SEED 2022 Share Incentive Plan [Member]
Research and development	$ 196,000	$ 142,000