Note 6 - Preferred Stock (Details Textual) - USD ($)			12 Months Ended		21 Months Ended
	Oct. 06, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Aug. 23, 2024	Mar. 30, 2023	Dec. 31, 2022
Preferred Stock, Shares Authorized (in shares)			42,000	42,000	42,000
Preferred Stock, Shares Designated (in shares)			1,983,250		1,983,250
Preferred Stock, Shares Issued (in shares)			545	1,930	545
Preferred Stock, Shares Outstanding (in shares)			545	1,930	545
Proceeds from Warrant Exercises				$ 534,000
Class of Warrant or Right, Outstanding (in shares)			2,272,203		2,272,203
Preferred Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 975		$ 975
Warrants and Rights Outstanding, Term (Year)			3 years		3 years
Class of Warrant or Right, Percentage of Securities Called by Warrants or Rights			100.00%		100.00%
Class of Warrant or Right, Exercised (in shares)			1,648
Class of Warrant or Right, Exercise Price of Warrants or Rights Exercised (in dollars per share)			$ 975
Proceeds from Warrant Exercises			$ 1,607,000
Proceeds From Warrant Exercises, Net			$ 1,478,000	$ 5,364,000
Class of Warrant or Right, Outstanding (in shares)			31,102		31,102
Class of Warrant or Right, Cash Fee, Percentage of Proceeds			8.00%
Stock Issued During Period, Shares, Warrants Exercised (in shares)			1,648
Class of Warrant or Right, Cash Fee			$ 129,000
Common Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 3.41	$ 69.03	$ 3.41			$ 2,653.8
Warrants and Rights Outstanding, Term (Year)			5 years		5 years
Class of Warrant or Right, Exercised (in shares)			282,314	18,681
Class of Warrant or Right, Exercise Price of Warrants or Rights Exercised (in dollars per share)			$ 3.41	$ 31.18
Proceeds from Warrant Exercises			$ 964,000
Proceeds From Warrant Exercises, Net			$ 903,000
Class of Warrant or Right, Issued (in shares)			24,104	113,597
Class of Warrant or Right, Outstanding (in shares)			2,272,203	103,453	2,272,203	2,401,047		8,609
Class of Warrant or Right, Cash Fee, Percentage of Proceeds			8.00%
Class of Warrant or Right, Cash Fee			$ 77,000
Conversion of Series F Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Converted (in shares)			3,033	4,620
Conversion of Stock, Shares Issued (in shares)			288,968	352,624	641,592
Series F Preferred Stock [Member]
Preferred Stock, Convertible, Conversion Price (in dollars per share)			$ 11.17		$ 11.17		$ 68.4
Preferred Stock, Convertible, Conversion Price Percentage							80.00%
Preferred Stock, Convertible, Floor Price (in dollars per share)	$ 11.17		$ 11.17		$ 11.17
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)			3,033	4,620
Preferred Stock, Shares Outstanding (in shares)			545	1,930	545
Dividends Payable			$ 29,000	$ 136,000	$ 29,000
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