Note 3 - Business Combination - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Jan. 09, 2023
Goodwill		$ 0
Old Catheter [Member]
Cash and cash equivalents			$ 15
Accounts receivable			71
Inventories			52
Prepaid expenses and other current assets	$ 1,400		23
Property and equipment, net			26
Lease right-of-use assets			119
Other assets			8
Goodwill			60,934	$ 56,000
Total assets acquired			89,609
Accounts payable			922
Accrued expenses			1,389
Lease liability			124
Interest payable			198
Convertible promissory notes			250
Royalties payable due to related parties			14,182	7,600
Total liabilities assumed			17,065
Total purchase price			72,544
Old Catheter [Member] | Developed Technology Rights [Member]
Intangibles			27,014	35,100
Old Catheter [Member] | Customer Relationships [Member]
Intangibles			62	220
Old Catheter [Member] | Trademarks [Member]
Intangibles			$ 1,285	$ 1,700