Note 14 - Preferred Stock (Details Textual) - USD ($) $ / shares in Units, $ in Millions												12 Months Ended
	Jul. 23, 2024	Jul. 22, 2024	Jul. 11, 2024	Jul. 01, 2024	Jan. 24, 2024	Oct. 24, 2023	Jul. 24, 2023	Jul. 05, 2023	Mar. 23, 2023	Mar. 21, 2023	Jan. 09, 2023	Dec. 31, 2024	Dec. 31, 2023
Conversion of Series X Convertible Preferred Stock into Common Stock [Member]
Conversion of Stock, Shares Issued (in shares)						1,868			197,491	199,359
Conversion of Stock, Shares Converted (in shares)						18.676			1,974.905	1,993.581
Series X Preferred Stock [Member]
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)											100
Preferred Stock, Convertible, Conversion Price (in dollars per share)											$ 32
Preferred Stock, Shares Outstanding (in shares)												12,656	12,656
Series A Convertible Preferred Stock [Member]
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)												62.5
Conversion of Stock, Shares Issued (in shares)	25,000	62,500	62,489	81,423	54,678		54,678	109,355
Conversion of Stock, Shares Converted (in shares)	400	1,000	1,000	1,303	875		875	1,750
Preferred Stock, Shares Outstanding (in shares)												0
Conversion of Stock, Maximum Threshold Percentage Allowing Conversion												9.99%
Old Catheter [Member] | Series X Preferred Stock [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares)											14,649.592
Old Catheter [Member] | Conversion of Convertible Promissory Notes into Series X Preferred Stock [Member]
Debt Conversion, Original Debt, Amount											$ 25.2