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Note 11 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	6 Months Ended		24 Months Ended
	Oct. 07, 2025	Apr. 30, 2026	Jun. 30, 2026	Jun. 30, 2025	May 13, 2026	May 15, 2026	Oct. 29, 2025	Sep. 30, 2025	Jun. 02, 2025	May 31, 2025	Apr. 18, 2025	May 03, 2024
Cash PIPE Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.01
Crypto PIPE Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.01
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	14,903,393
Prefunded Warrant [Member]
Class of Warrant or Right, Exercised During Period (in shares)			6,146,671
Class of Warrant or Right, Outstanding (in shares)			9,972,424
Stock Warrants [Member]
Issued, shares (in shares)			0	0
Sales Agreement [Member]
Sale of Stock, Commissions, Percent												3.00%
Sale of Stock, Additional Amount											$ 1.5
Sale of Stock, Remaining Available Balance								$ 2.3		$ 1.4
Sale of Stock, Maximum Amount			$ 83.0			$ 100.0	$ 18.3		$ 3.4
Stock Issued During Period, Shares, New Issues (in shares)		1,063,864
Shares Issued, Price Per Share (in dollars per share)		$ 10.22
Net Proceeds from Issuance of Common Stock		$ 10.3
Stock Issued During Period, Value, New Issues					$ 17.0
Equity Offering, Remaining Capacity			$ 83.0
Equity Offering, Public Float Threshold						$ 75.0
Cash PIPE SPA [Member]
Stock Issued During Period, Shares, New Issues (in shares)	4,366,703
Shares Issued, Price Per Share (in dollars per share)	$ 11.6265