Note 6 - Common Stock (Details Textual) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended
	Feb. 28, 2026	May 31, 2026	Feb. 28, 2026	Jun. 30, 2026	Dec. 31, 2025	Nov. 30, 2019
May 2026 Prefunded Warrants [Member]
Class of Warrants or Rights, Issued During Period		2,070,044
Warrants Issued, Price Per Warrant		$ 5.669
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.001
Underwritten Public Offering Pre-funded Warrants [Member]
Class of Warrants or Rights, Issued During Period	952,881		952,881
Warrants Issued, Price Per Warrant			$ 2.749
Private Placement Pre-funded Warrants [Member]
Class of Warrants or Rights, Issued During Period	631,332		631,332
Warrants Issued, Price Per Warrant	$ 2.749
Prefunded Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	0.001		$ 0.001	$ 0.001	$ 0.001	$ 0.001
May 2026 Offering [Member]
Stock Issued During Period, Shares, New Issues		3,220,961
Shares Issued, Price Per Share		$ 5.67
Proceeds from Issuance or Sale of Equity		$ 27.7
February 2026 Offering [Member]
Stock Issued During Period, Shares, New Issues			3,505,855
Shares Issued, Price Per Share	$ 2.75		$ 2.75
Proceeds from Issuance or Sale of Equity			$ 12.6