Note 6 - Preferred Stock - Schedule of Stock by Class (Details) - USD ($)	3 Months Ended	9 Months Ended		12 Months Ended		24 Months Ended	33 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Sep. 30, 2025	Jun. 05, 2025	Mar. 30, 2023
Preferred stock, shares outstanding (in shares)	150	150		545		545	150
Accrued Dividends amount		$ 29,000	$ 76,000
Conversion of Series F Preferred Stock to Common Stock [Member]
Conversions, Shares Issued (in shares)	212,454	257,617	288,968	288,947	352,624	641,571	899,188
Accrued Dividends amount	$ 20,000	$ 39,000	$ 194,000
Conversions, preferred (in shares)	(780)	(970)	(3,033)
Series F Preferred Stock [Member]
Preferred stock, shares outstanding (in shares)	150	150		545	1,930	545	150
Balance dividend	$ 19,000,000	$ 19,000,000		$ 29,000,000	$ 136,000,000	$ 29,000,000	$ 19,000,000
Convertible, Conversion Price (in dollars per share)	$ 3.77	$ 3.77	$ 11.17	$ 11.17	$ 13.6	$ 11.17	$ 3.77	$ 3.77	$ 68.4
Issuance, preferred (in shares)		575		1,648
Accrued Dividends amount		$ 29,000,000		$ 89,000,000
Conversions, preferred (in shares)		(970)		(3,033)
Conversions dividend		$ (39,000,000)		$ (196,000,000)
Series F Preferred Stock [Member] | Weighted Average [Member]
Convertible, Conversion Price (in dollars per share)				$ 11.2		$ 11.2