Note 11 - Stockholders' Equity (Deficit) (Details Textual) $ in Thousands					3 Months Ended	9 Months Ended
	Feb. 20, 2026 shares	Oct. 16, 2025 shares	Oct. 09, 2025 shares	Aug. 19, 2025 shares	Mar. 31, 2026 USD ($) shares	Sep. 30, 2026 shares	Mar. 12, 2026 shares	Mar. 11, 2026 shares	Dec. 31, 2025 shares
Common Stock, Shares Authorized (in shares)						5,000,000,000	5,000,000,000	1,500,000,000	5,000,000,000
Preferred Stock, Shares Authorized (in shares)						5,000,000			5,000,000
Undesignated Preferred Stock						5,000,000
Stock Issued During Period, Shares, Reverse Stock Splits (in shares)	45,912
Conversion of Series D Preferred Stock into Common Stock [Member]
Conversion of Stock, Shares Issued		15,400,000
Series B Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)						0			131
Series B Preferred Stock [Member] | The 2021 Private Placement Program [Member]
Stock Issued During Period, Shares, New Issues (in shares)					131				131
Series B Preferred Stock, Post-split [Member] | The 2021 Private Placement Program [Member]
Preferred Stock, Convertible, Shares Issuable					3,013
Series D Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)						0
Convertible Preferred Stock, Shares Issued upon Conversion		32
Series D Preferred Stock [Member] | 2025 Preferred Stock Purchase Agreement [Member]
Preferred Stock, Convertible, Shares Issuable				15,400,000
Stock Issued During Period, Shares, New Issues			441,326	481,250
Series E Preferred Stock [Member]
Preferred Stock, Convertible, Shares Issuable		8,600,000
Stock Issued During Period, Shares, New Issues		268,750
Convertible Preferred Stock, Shares Issued upon Conversion		32
Series E Preferred Stock [Member] | 2025 Preferred Stock Purchase Agreement [Member]
Preferred Stock, Convertible, Shares Issuable				8,600,000
Stock Issued During Period, Shares, New Issues		268,750	268,750	268,750
Series F Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)						0
Stock Issued During Period, Shares, New Issues				1,986,565
Stock Redeemed or Called During Period, Shares					1,346,633
Stock Redeemed or Called During Period, Value | $					$ 350
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	5					5