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Note 8 - Financial Instruments Fair Value Measurements - Schedule of Fair Value Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Feb. 03, 2026	Dec. 31, 2025
Debt instrument, fair value	$ 15,100		$ 11,100
Rights Liability [Member]
Rights liability - Lucid Diagnostics common stock	321	$ 375
September 2022 Senior Convertible Note [Member]
Debt instrument, fair value		$ 11,149	11,100
The 2026 Note [Member]
Debt instrument, fair value	15,100
Fair Value, Recurring [Member]
Investment in Lucid Diagnostics common stock	33,494		34,120
Total assets at fair value	33,494		34,120
Total liabilities at fair value	15,421		11,100
Fair Value, Recurring [Member] \| Rights Liability [Member]
Rights liability - Lucid Diagnostics common stock	321
Fair Value, Recurring [Member] \| September 2022 Senior Convertible Note [Member]
Debt instrument, fair value			11,100
Fair Value, Recurring [Member] \| The 2026 Note [Member]
Debt instrument, fair value	15,100
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Investment in Lucid Diagnostics common stock	33,494		34,120
Total assets at fair value	33,494		34,120
Total liabilities at fair value	321		0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| Rights Liability [Member]
Rights liability - Lucid Diagnostics common stock	321
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| September 2022 Senior Convertible Note [Member]
Debt instrument, fair value			0
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member] \| The 2026 Note [Member]
Debt instrument, fair value	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Investment in Lucid Diagnostics common stock	0		0
Total assets at fair value	0		0
Total liabilities at fair value	0		0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| Rights Liability [Member]
Rights liability - Lucid Diagnostics common stock	0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| September 2022 Senior Convertible Note [Member]
Debt instrument, fair value			0
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member] \| The 2026 Note [Member]
Debt instrument, fair value	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Investment in Lucid Diagnostics common stock	0		0
Total assets at fair value	0		0
Total liabilities at fair value	15,100		11,100
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| Rights Liability [Member]
Rights liability - Lucid Diagnostics common stock	0
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| September 2022 Senior Convertible Note [Member]
Debt instrument, fair value			$ 11,100
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member] \| The 2026 Note [Member]
Debt instrument, fair value	$ 15,100