Note 7 - Commitments and Contingencies (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Operating Lease, Monthly Rent Payment	$ 4,700
Operating Lease, Rent Expense, Annual Increase In Rent, Percent	2.00%
Sublease Income		$ 12,000	$ 12,000	$ 24,000	$ 25,000
Operating Lease, Payments		38,000	38,000	68,000	75,000
License Agreements Expense		377,000	176,000	533,000	331,000
Houston Pharmaceuticals, Inc [Member]
Related Party Transaction, Amounts of Transaction		59,000	59,000	117,000	117,000
MD Anderson [Member]
License Agreements Expense		$ 63,000	$ 64,000	$ 117,000	$ 129,000