Note 5 - Stockholders' Equity - Schedule of Stock Warrants (Details)	Mar. 31, 2026 $ / shares shares
Number of Shares (in shares)	5,371,914
September 2021 Warrants [Member]
Number of Shares (in shares)	268
Exercise Price (in dollars per share) | $ / shares	$ 4,875
Warrants Issued in July 2025 Offering [Member]
Number of Shares (in shares)	490,000
Exercise Price (in dollars per share) | $ / shares	$ 4.35
Warrants Issued in September 2025 Offering [Member]
Number of Shares (in shares)	476,196
Exercise Price (in dollars per share) | $ / shares	$ 1.1877
December 2025 Offering Warrants [Member]
Number of Shares (in shares)	2,270,330
Exercise Price (in dollars per share) | $ / shares	$ 1.1877
February 2026 Warrants [Member]
Number of Shares (in shares)	432,902
Exercise Price (in dollars per share) | $ / shares	$ 2.31
March 2026 Warrants [Member]
Number of Shares (in shares)	1,269,316
Exercise Price (in dollars per share) | $ / shares	$ 1.36