Note 6 - Preferred Stock (Details Textual) - USD ($)			3 Months Ended	12 Months Ended			24 Months Ended	36 Months Ended
	Oct. 06, 2023	Mar. 31, 2023	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2025	Mar. 30, 2023
Preferred Stock, Shares Authorized (in shares)				42,000	42,000		42,000	42,000
Preferred Stock, Shares Designated (in shares)				1,983,250	1,983,250		1,983,250	1,983,250
Preferred Stock, Shares Issued (in shares)				150	545		545	150
Preferred Stock, Shares Outstanding (in shares)				150	545		545	150
Preferred Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 975	$ 975	$ 975		$ 975	$ 975
Warrants and Rights Outstanding, Term (Month)			3 years
Class of Warrant or Right, Percentage of Securities Called by Warrants or Rights			100.00%
Class of Warrant or Right, Exercised (in shares)				575	1,648
Proceeds from Warrant Exercises				$ 561,000	$ 1,607,000
Proceeds From Warrant Exercises, Net				$ 516,000	1,478,000
Class of Warrant or Right, Outstanding (in shares)				30,527				30,527
Class of Warrant or Right, Cash Fee, Percentage of Proceeds				8.00%
Class of Warrant or Right, Cash Fee				$ 45,000	$ 129,000
Conversion of Series F Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)				970	3,033
Conversion of Stock, Shares Issued (in shares)				257,617	288,968	352,624	641,592	899,209
Series F Preferred Stock [Member]
Preferred Stock, Convertible, Conversion Price (in dollars per share)	$ 3.77			$ 3.77	$ 11.17		$ 11.17	$ 3.77	$ 68.4
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	3,033
Preferred Stock, Shares Outstanding (in shares)				150	545	1,930	545	150
Dividends Payable				$ 22,000	$ 29,000	$ 131,000	$ 29,000	$ 22,000
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
Maximum [Member]
Preferred Stock, Shares Authorized (in shares)				5,000,000				5,000,000