Note 4 - Equity Method Investment - Aggregate Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Net income (loss) attributable to common stockholders	$ (5,479)	$ (13,308)	$ (12,467)	$ 4,386
Lucid Diagnostics [Member]
Revenue	1,474		2,730
Net income (loss) attributable to common stockholders	$ (14,715)		$ (38,343)

Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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+ Details

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details