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Note 17 - Related Parties (Details Textual) - USD ($)										1 Months Ended	12 Months Ended
Note 17 - Related Parties (Details Textual) - USD ($)	Dec. 31, 2025	Jun. 02, 2025	Jan. 29, 2025	Jan. 06, 2025	Oct. 28, 2024	Oct. 25, 2024	Sep. 03, 2024	May 01, 2024	Jan. 09, 2023	Apr. 30, 2025	Dec. 31, 2025	Jul. 11, 2025	Jun. 20, 2025	Feb. 28, 2025	Dec. 31, 2024	Aug. 23, 2024	Aug. 22, 2024	Jul. 25, 2024	May 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)		13,154
Class of Warrant or Right, Issued in Period (in shares)											579,098
Class of Warrant or Right, Exercised in Period (in shares)											162,947
Cardionomix Inc. [Member]
Subsidiary, Ownership Percentage, Parent	82.00%										82.00%			82.00%
KardioNav, Inc. [Member]
Subsidiary, Ownership Percentage, Parent	57.00%										57.00%		57.00%
KardioNav, Inc. [Member] \| Chelak iECG, Inc. [Member]
Subsidiary, Ownership Percentage, Parent													33.00%
Series M Warrants [Member]
Class of Warrant or Right, Issued in Period (in shares)	340,000
Warrants and Rights Outstanding	$ 509,000										$ 509,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 1.56										$ 1.56
Series H Warrants [Member]
Class of Warrant or Right, Exercised in Period (in shares)						104,737
Series I Warrants [Member]
Class of Warrant or Right, Exercised in Period (in shares)						122,368
Non-plan Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)											26,315
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)		1,315
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	26,315										26,315				1,315
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 10.07										$ 10.07				$ 101.1
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)											$ 10.07
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)											160,360
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	123,678										123,678				3,701
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 8.07										$ 8.07				$ 88.72
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)											$ 6.34
Chief Commercial Officer [Member] \| Non-plan Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)			13,154					1,315
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)			$ 7.98					$ 101.1
Chief Commercial Officer [Member] \| Share-Based Payment Arrangement, Tranche Two [Member] \| Non-plan Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)			1,315
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)			4 years
Chief Commercial Officer [Member] \| Share-Based Payment Arrangement, Tranche One [Member] \| Non-plan Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)			1,315
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage								20.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)								5 years
Chief Commercial Officer [Member] \| Share-Based Payment Arrangement, Tranche Three [Member] \| Non-plan Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)			1,644
Chief Financial Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)				26,315
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)				$ 10.07
Chief Financial Officer [Member] \| Non-plan Options [Member]
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)				$ 10.07
Chief Financial Officer [Member] \| Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)				36 months
Chief Financial Officer [Member] \| Share-Based Payment Arrangement, Tranche One [Member] \| Non-plan Options [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)				3 years
Old Catheter [Member] \| Mr. Jenkins and Affiliates [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)											1,325.838
Old Catheter [Member] \| Mr. Jenkins Adult Children [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)											1,284.344
Conversion of Royalties Payable into Series J Preferred Stock [Member] \| Inventor of LockeT [Member]
Conversion of Stock, Shares Issued (in shares)	9,490
LockeT Royalty [Member] \| Inventor of LockeT [Member]
Royalty Percentage										5.00%
Royalty Guarantees, Commitments, Amount										$ 1,000,000
LockeT Royalty [Member] \| Royalty Payment After U.S. Patent Granted and One Million Paid [Member] \| Inventor of LockeT [Member]
Royalty Percentage									2.00%
Royalty Guarantees, Commitments, Amount										10,000,000
David Jenkins [Member]
Convertible Notes Payable									$ 25,100,000
Interest Accrued and Unpaid, Forgiven Amount									$ 13,900,000
David Jenkins [Member] \| LockeT Royalty [Member]
Royalty Percentage									12.00%
David Jenkins [Member] \| Conversion of Convertible Promissory Notes into Series X Preferred Stock [Member]
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)									7,856.251
Auston Locke [Member] \| LockeT Royalty [Member]
Royalty Percentage									5.00%
Royalty Guarantees, Commitments, Amount									$ 1,000,000	$ 1,000,000
Auston Locke [Member] \| LockeT Royalty [Member] \| Royalty Payment After U.S. Patent Granted and One Million Paid [Member]
Royalty Percentage										5.00%
Royalty Guarantees, Commitments, Amount										$ 10,000,000
Increase in Royalty Percentage										2.00%
Non-Executive Chief Operating Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)											757
Non-Executive Chief Operating Officer [Member] \| Share-Based Payment Arrangement, Tranche Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares)											17
Non-Executive Chief Operating Officer [Member] \| Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	740										740
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 112.1										$ 112.1
Related Party [Member] \| Related Party Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage												4.20%				12.00%	8.00%
Debt Instrument, Face Amount												$ 150,000
Related Party [Member] \| Related Party Notes [Member] \| Series M Warrants [Member]
Class of Warrant or Right, Issued in Period (in shares)	170,000
Jenkins Family Charitable Institute [Member]
Debt Instrument, Face Amount	$ 500,000										$ 500,000
Proceeds from Issuance Initial Public Offering							$ 500,000
Stock Issued During Period, Shares, New Issues (in shares)							13,947
Jenkins Family Charitable Institute [Member] \| Prefunded Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							12,368
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 0.0019
Class of Warrant or Right, Exercised in Period (in shares)					12,368
Stock Issued During Period, Shares, Warrant Exercises (in shares)					12,368
Jenkins Family Charitable Institute [Member] \| Series H Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							26,316
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 19
Jenkins Family Charitable Institute [Member] \| Series I Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							26,316
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 19
Jenkins Family Charitable Institute [Member] \| Series J Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)							26,316
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)							$ 19
Class of Warrant or Right, Distributed (in shares)					23,684
Jenkins Family Charitable Institute [Member] \| Related Party Notes [Member]
Debt Instrument, Face Amount																		$ 500,000
Mr. Jenkins [Member]
Debt Instrument, Face Amount	$ 500,000										$ 500,000
Mr. Jenkins [Member] \| Cardionomix Inc. [Member]
Subsidiary, Ownership Percentage, Parent													3.00%	5.00%
Mr. Jenkins [Member] \| Related Party Notes [Member]
Debt Instrument, Face Amount																			$ 500,000
Mr. Jenkins and Affiliates [Member] \| Cardionomix Inc. [Member]
Subsidiary, Ownership Percentage, Parent													7.00%	7.00%
Certain Third Parties [Member] \| Cardionomix Inc. [Member]
Subsidiary, Ownership Percentage, Parent														6.00%