Note 10 - Equity - Outstanding Warrants (Details) - $ / shares	Jun. 30, 2026	Dec. 31, 2025
Outstanding warrants (in shares)	2,542,304	1,293,334
Warrant 1 [Member]
Outstanding warrants (in shares)	120,000	120,000
Outstanding warrants, expiration date (in dollars per share)	$ 4.56
Underwriter Purchase Warrants August 14, 2025 [Member]
Outstanding warrants (in shares)	746,668
Outstanding warrants, expiration date (in dollars per share)	$ 2.58
Underwriter Purchase Warrants September 15, 2025 [Member]
Outstanding warrants (in shares)	112,000
Outstanding warrants, expiration date (in dollars per share)	$ 2.58
Warrant 4 [Member]
Outstanding warrants (in shares)	100,000	100,000
Outstanding warrants, expiration date (in dollars per share)	$ 4.56
Underwriter Purchase Warrants January 30, 2026 [Member]
Outstanding warrants (in shares)	1,272,727
Outstanding warrants, expiration date (in dollars per share)	$ 3.16
Underwriter Purchase Warrants March 3, 2026 [Member]
Outstanding warrants (in shares)	190,909
Outstanding warrants, expiration date (in dollars per share)	$ 3.16
Underwriter Purchase Warrants 1 [Member]
Outstanding warrants (in shares)	858,668	1,073,334
Outstanding warrants, expiration date (in dollars per share)	$ 2.58
Underwriter Purchase Warrants 2 [Member]
Outstanding warrants (in shares)	1,463,636	0
Outstanding warrants, expiration date (in dollars per share)	$ 3.16