Note 6 - Preferred Stock - Schedule of Stock by Class (Details) - USD ($)	12 Months Ended			24 Months Ended	36 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2025	Oct. 06, 2023	Mar. 30, 2023
Preferred stock, shares outstanding (in shares)	150	545		545	150
Accrued Dividends amount	$ 32,000	$ 89,000
Conversion of Series F Preferred Stock to Common Stock [Member]
Conversions, Shares Issued (in shares)	257,617	288,968	352,624	641,592	899,209
Accrued Dividends amount	$ 39,000	$ 191,000
Conversions, preferred (in shares)	(970)	(3,033)
Series F Preferred Stock [Member]
Preferred stock, shares outstanding (in shares)	150	545	1,930	545	150
Balance dividend	$ 22,000	$ 29,000	$ 131,000	$ 29,000	$ 22,000
Issuance, preferred (in shares)	575	1,648
Accrued Dividends amount	$ 32,000	$ 89,000
Conversions, preferred (in shares)	(970)	(3,033)
Conversions dividend	$ (39,000)	$ (191,000)
Convertible, Conversion Price (in dollars per share)	$ 3.77	$ 11.17		$ 11.17	$ 3.77	$ 3.77	$ 68.4
Series F Preferred Stock [Member] | Weighted Average [Member]
Convertible, Conversion Price (in dollars per share)		$ 11.17		$ 11.17