Note 7 - Preferred Stock - Schedule of Stock by Class (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Mar. 30, 2023
Preferred stock, shares outstanding (in shares)	150		150
Accrued Dividends amount	$ 4,000	$ 12,000
Conversion of Series F Preferred Stock to Common Stock [Member]
Conversions, Shares Issued (in shares)	899,209		257,617	641,592
Conversions, preferred (in shares)	0	0
Series F Preferred Stock [Member]
Preferred stock, shares outstanding (in shares)	150		150	545
Balance dividend	$ 26,000		$ 22,000	$ 29,000
Convertible, Conversion Price (in dollars per share)	$ 3.77	$ 11.17	$ 3.77	$ 11.17	$ 3.77
Issuance, preferred (in shares)			575
Accrued Dividends amount	$ 4,000		$ 32,000
Conversions, preferred (in shares)			(970)
Conversions dividend			$ (39,000)
Series F Preferred Stock [Member] | Weighted Average [Member]
Convertible, Conversion Price (in dollars per share)			$ 3.77