Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 4,109	$ 3,025
Marketable securities	25,929	41,122
Prepaid expenses and other assets	680	227
Deposits	200	0
Amounts receivable	161	236
Total current assets	31,079	44,610
Non-current assets:
Operating lease right-of-use asset, net	239	279
Property and equipment, net	152	148
Deposits	0	1,308
Total non-current assets	391	1,735
Total assets	31,470	46,345
Liabilities, Current [Abstract]
Accounts payable	1,261	940
Accrued liabilities	2,747	4,347
Operating lease obligation	96	90
Finance lease obligation	12	13
Total current liabilities	4,116	5,390
Liabilities, Noncurrent [Abstract]
Operating lease obligation	176	225
Finance lease obligation	8	12
Total non-current liabilities	184	237
Shareholders' Equity:
Common shares, no par value; unlimited authorized; 43,072,488 and 42,818,660 shares issued and outstanding, as of June 30, 2025 and December 31, 2024, respectively	0	0
Paid-in capital	182,592	180,697
Accumulated other comprehensive income (loss)	(14)	23
Accumulated deficit	(155,408)	(140,002)
Total shareholders’ equity	27,170	40,718
Total liabilities and shareholders’ equity	$ 31,470	$ 46,345