Note 5 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Total Assets	$ 604	$ 598
Total Liabilities	(536)	(604)
March 2025 Senior Secured Notes [Member]
Senior secured notes payable	(374)
Embedded Derivative Financial Instruments, Convertible Promissory Note [Member]
Derivative liability		(299)
Embedded Derivative Financial Instruments, Convertible Notes [Member]
Derivative liability	(162)	(305)
Fair Value, Inputs, Level 1 [Member]
Total Assets	604	598
Total Liabilities	0	0
Fair Value, Inputs, Level 1 [Member] | March 2025 Senior Secured Notes [Member]
Senior secured notes payable	0
Fair Value, Inputs, Level 1 [Member] | Embedded Derivative Financial Instruments, Convertible Promissory Note [Member]
Derivative liability		0
Fair Value, Inputs, Level 1 [Member] | Embedded Derivative Financial Instruments, Convertible Notes [Member]
Derivative liability	0	0
Fair Value, Inputs, Level 2 [Member]
Total Assets	0	0
Total Liabilities	0	0
Fair Value, Inputs, Level 2 [Member] | March 2025 Senior Secured Notes [Member]
Senior secured notes payable	0
Fair Value, Inputs, Level 2 [Member] | Embedded Derivative Financial Instruments, Convertible Promissory Note [Member]
Derivative liability		0
Fair Value, Inputs, Level 2 [Member] | Embedded Derivative Financial Instruments, Convertible Notes [Member]
Derivative liability	0	0
Fair Value, Inputs, Level 3 [Member]
Total Assets	0	0
Total Liabilities	(536)	(604)
Fair Value, Inputs, Level 3 [Member] | March 2025 Senior Secured Notes [Member]
Senior secured notes payable	(374)
Fair Value, Inputs, Level 3 [Member] | Embedded Derivative Financial Instruments, Convertible Promissory Note [Member]
Derivative liability		(299)
Fair Value, Inputs, Level 3 [Member] | Embedded Derivative Financial Instruments, Convertible Notes [Member]
Derivative liability	(162)	(305)
Money Market Funds [Member]
Cash equivalents	604	598
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents	604	598
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Cash equivalents	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Cash equivalents	$ 0	$ 0