Note 5 - Capital Stock (Details Textual) - USD ($)					3 Months Ended			4 Months Ended	5 Months Ended	6 Months Ended	9 Months Ended		12 Months Ended		24 Months Ended	33 Months Ended
		Jun. 06, 2025	Jun. 04, 2025	Mar. 30, 2023	Sep. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Sep. 30, 2025	Jun. 05, 2025	Apr. 17, 2025	Aug. 23, 2024	Oct. 06, 2023	Mar. 31, 2023
Common Stock, Shares Authorized (in shares)					150,000,000			150,000,000	150,000,000		150,000,000		150,000,000		150,000,000	150,000,000
Common Stock, Shares, Issued (in shares)					3,207,399			3,207,399	3,207,399		3,207,399		1,144,926		1,144,926	3,207,399
Common Stock, Shares, Outstanding (in shares)					3,207,210			3,207,210	3,207,210		3,207,210		1,144,737		1,144,737	3,207,210
Dividends, Preferred Stock											$ 29,000	$ 76,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)					$ 0.0001			$ 0.0001	$ 0.0001		$ 0.0001		$ 0.0001		$ 0.0001	$ 0.0001
Warrant Adjustment, Deemed Dividend					$ 0		$ 8,974,000				$ 0	$ 8,974,000	$ 8,974,000
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.0001			$ 0.0001			$ 0.0001	$ 0.0001		$ 0.0001		$ 0.0001		0.0001	$ 0.0001
Warrants Post Reverse Split [Member]
Class of Warrant or Right, Outstanding (in shares)	[1]				127,531			127,531	127,531		127,531					127,531
Series F Preferred Stock [Member]
Stock Issued During Period, Shares, Warrants Exercised (in shares)					575						575	1,648
Conversion of Stock, Shares Converted (in shares)											970		3,033
Dividends, Preferred Stock											$ 29,000,000		$ 89,000,000
Stock Issued During Period, Shares, New Issues (in shares)											575		1,648
Preferred Stock, Convertible, Conversion Price (in dollars per share)				$ 68.4	$ 3.77		$ 11.17	$ 3.77	$ 3.77		$ 3.77	$ 11.17	$ 11.17	$ 13.6	$ 11.17	$ 3.77	$ 3.77
Preferred Stock, Convertible, Floor Price (in dollars per share)																				$ 11.17
Private Placement [Member] | Series F Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)				6,550
Preferred Stock, Par or Stated Value Per Share (in dollars per share)				$ 0.0001
The 2025 Private Placement [Member]
Legal Fees			$ 50,000
Conversion of Series F Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Issued (in shares)					212,454						257,617	288,968	288,947	352,624	641,571	899,188
Conversion of Stock, Shares Converted (in shares)					780						970	3,033
Dividends, Preferred Stock					$ 20,000						$ 39,000	$ 194,000
Common Stock Warrants [Member]
Stock Issued During Period, Shares, Warrants Exercised (in shares)					116,861		208,933				521,725
Class of Warrant or Right, Exercised (in shares)					116,861		208,933				521,725
Proceeds From Warrant Exercises, Net											$ 1,639,000	$ 672,000
Prefunded Warrants [Member]
Stock Issued During Period, Shares, Warrants Exercised (in shares)					1,283,131
Class of Warrant or Right, Exercised (in shares)					1,283,131						1,283,131
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)		1,989,392
Class of Warrant or Right, Cash Fee, Percentage of Proceeds			5.00%
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 3.77			$ 3.77			$ 3.77	$ 3.77		$ 3.77					$ 3.77
Warrants and Rights Outstanding, Term (Month)		12 months
Class of Warrant or Right, Outstanding (in shares)					706,261			706,261	706,261		706,261					706,261
Proceeds From Warrant Exercises, Net		$ 6,888,000
Class of Warrant or Right, Cash Fee		375,000
Proceeds from Issuance of Warrants		7,500,000
Other Expenses		$ 237,000
Dividends per Warrant or Right (in dollars per share)		$ 3.7699
Class of Warrant or Right, Maximum Beneficial Ownership		4.99%
Class of Warrant or Right, Maximum Beneficial Ownership, Election of Holder		9.99%
Percent of Stock Ownership, Warrant Transaction Threshold for Shares		50.00%
Preferred Warrants [Member]
Class of Warrant or Right, Exercised (in shares)					575						575	1,648
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				32,750
Class of Warrant or Right, Cash Fee, Percentage of Proceeds										8.00%
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)						$ 975
Warrants and Rights Outstanding, Term (Month)						3 years
Class of Warrant or Right, Outstanding (in shares)					30,527			30,527	30,527		30,527					30,527
Proceeds from Warrant Exercises					$ 561,000						$ 561,000	$ 1,607,000
Proceeds From Warrant Exercises, Net					516,000						516,000	1,478,000
Class of Warrant or Right, Cash Fee					$ 45,000						45,000	$ 129,000
Investor Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				95,764
Placement Agent Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)				7,663																	103,427
Class of Warrant or Right, Cash Fee, Percentage of Proceeds				8.00%
Preferred Stock, Convertible, Conversion Price (in dollars per share)																					$ 68.4
Class of Warrant or Right, Beneficial Ownership Percentage																					4.99%
Class of Warrant or Right, Outstanding (in shares)																			153,470
Warrant Adjustment, Deemed Dividend											$ 539,000
Placement Agent Warrants [Member] | Warrants Post Reverse Split [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	[1]				$ 68.4			$ 68.4	$ 68.4		$ 68.4					$ 68.4
Class of Warrant or Right, Outstanding (in shares)	[1]				7,663			7,663	7,663		7,663					7,663
Common Warrants Issued from Preferred Warrants [Member]
Stock Issued During Period, Shares, Warrants Exercised (in shares)					116,861		208,933				521,725
Class of Warrant or Right, Exercised (in shares)					116,861		208,933				521,725
Class of Warrant or Right, Cash Fee, Percentage of Proceeds						8.00%
Class of Warrant or Right, Issued (in shares)					152,519						152,519		24,104
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					$ 3.41			$ 3.41	$ 3.41		$ 3.41					$ 3.41
Warrants and Rights Outstanding, Term (Month)					5 years			5 years	5 years		5 years		5 years		5 years	5 years
Class of Warrant or Right, Exercise Price of Warrants or Rights Exercised (in dollars per share)					$ 3.41						$ 3.41
Proceeds from Warrant Exercises					$ 399,000		$ 713,000				$ 1,781,000
Proceeds From Warrant Exercises, Net					367,000		671,000				1,639,000
Class of Warrant or Right, Cash Fee					$ 32,000		$ 57,000				$ 142,000
Common Warrants Issued from Preferred Warrants [Member] | Warrants Post Reverse Split [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)													$ 68.4		$ 68.4
Common Warrants [Member]
Class of Warrant or Right, Exercised (in shares)											1,804,856		282,314
Class of Warrant or Right, Issued (in shares)											2,341,381		24,104
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					$ 3.56			$ 3.56	$ 3.56		$ 3.56		$ 3.41	$ 69.03	$ 3.41	$ 3.56
Class of Warrant or Right, Exercise Price of Warrants or Rights Exercised (in dollars per share)											$ 3.67		$ 3.41
Class of Warrant or Right, Outstanding (in shares)					2,808,728			2,808,728	2,808,728		2,808,728		2,272,203	103,453	2,272,203	2,808,728			2,401,047
The 2025 Placement Agent Warrants [Member]
Class of Warrant or Right, Exercised (in shares)								0
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			99,470
Class of Warrant or Right, Cash Fee, Percentage of Proceeds					5.00%						5.00%
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 4.7125		$ 4.71			$ 4.71	$ 4.71		$ 4.71					$ 4.71
Class of Warrant or Right, Outstanding (in shares)					99,470			99,470	99,470		99,470					99,470
Class of Warrant or Right, Cash Fee					$ 375,000						$ 375,000
Legal Fees					$ 50,000						$ 50,000
Advisor Warrants [Member]
Class of Warrant or Right, Exercised (in shares)									0
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)																	100,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)					$ 3.77			$ 3.77	$ 3.77		$ 3.77					$ 3.77	$ 3.77
Class of Warrant or Right, Outstanding (in shares)					100,000			100,000	100,000		100,000					100,000
Class of Warrant or Right, Vesting Percent																	8.33%
Class of Warrant or Right, Vesting During Period (in shares)									25,000
Stock Repurchase Program [Member]
Share Repurchase Program, Authorized, Amount																		$ 500,000
Share Repurchase Program, Remaining Authorized, Amount																		$ 500,000

[1] Adjusted by the Reverse Split.