Note 7 - Preferred Stock (Details Textual) - USD ($)			3 Months Ended		12 Months Ended
	Oct. 06, 2023	Mar. 31, 2023	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Mar. 30, 2023
Preferred Stock, Shares Authorized (in shares)			42,000		42,000
Preferred Stock, Shares Issued (in shares)			150		150
Preferred Stock, Shares Outstanding (in shares)			150		150
Preferred Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)				$ 975
Class of Warrant or Right, Percentage of Securities Called by Warrants or Rights				100.00%
Class of Warrant or Right, Exercised (in shares)			0	0
Class of Warrant or Right, Outstanding (in shares)			30,527
Conversion of Series F Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)			0	0
Private Placement [Member]
Proceeds from Issuance or Sale of Equity		$ 6,386,000
Proceeds from Issuance or Sale of Equity, Net		5,364,000
Payments of Stock Issuance Costs		$ 1,022,000
Series F Preferred Stock [Member]
Preferred Stock, Shares Authorized (in shares)			42,000
Preferred Stock, Shares Issued (in shares)			150
Preferred Stock, Convertible, Conversion Price (in dollars per share)			$ 3.77	$ 11.17	$ 3.77	$ 11.17	$ 3.77
Preferred Stock, Convertible, Conversion Price Percentage							80.00%
Preferred Stock, Stated Value Per Share (in dollars per share)	$ 1,000
Preferred Stock, Dividend Rate, Percentage	9.00%			20.00%
Conversion of Stock, Shares Converted (in shares)					970
Preferred Stock, Shares Outstanding (in shares)			150		150	545
Dividends Payable			$ 26,000		$ 22,000	$ 29,000
Maximum [Member]
Preferred Stock, Shares Authorized (in shares)			5,000,000