Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 7,716	$ 4,278
Prepaid expenses and other current assets	1,624	916
Total current assets	9,340	5,194
Furniture and equipment, net	127	159
Intangible assets	11,148	11,148
Operating lease right-of-use asset	398	424
Total assets	21,013	16,925
Liabilities, Current [Abstract]
Accounts payable	2,706	2,030
Accrued expenses and other current liabilities	4,190	3,329
Total current liabilities	6,896	5,359
Operating lease liability - long-term, net of current portion	326	358
Warrant liability - long-term	13,749	5,229
Total liabilities	20,971	10,946
Commitments and contingencies (Note 7)
Stockholders' equity
Preferred stock, $0.001 par value; 5,000,000 shares authorized, no shares issued or outstanding	0	0
Common stock, $0.001 par value; 100,000,000 shares authorized; 14,127,494 and 3,378,895 shares issued and outstanding at March 31, 2025 and December 31, 2024, respectively	14	3
Additional paid-in capital	159,869	159,384
Accumulated other comprehensive loss	(38)	(41)
Accumulated deficit	(159,803)	(153,367)
Total stockholders’ equity	42	5,979
Total liabilities and stockholders’ equity	$ 21,013	$ 16,925