Note 5 - Financial Instruments and Fair Value Measurements - Summary of Cash Equivalents' Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Reported Value Measurement [Member]
Total assets	$ 7,021	$ 12,191
Reported Value Measurement [Member] \| Fair Value, Recurring [Member]
Derivative liability	259	292
Total liabilities	259	292
Reported Value Measurement [Member] \| Money Market Funds [Member]
Money market funds	7,021	12,191
Estimate of Fair Value Measurement [Member]
Total assets	7,021	12,191
Estimate of Fair Value Measurement [Member] \| Fair Value, Recurring [Member]
Derivative liability	259	292
Total liabilities	259	292
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Total assets	7,021	12,191
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member] \| Fair Value, Recurring [Member]
Derivative liability	0	0
Total liabilities	0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Total assets	0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member] \| Fair Value, Recurring [Member]
Derivative liability	0	0
Total liabilities	0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Total assets	0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member] \| Fair Value, Recurring [Member]
Derivative liability	259	292
Total liabilities	259	292
Estimate of Fair Value Measurement [Member] \| Money Market Funds [Member]
Money market funds	7,021	12,191
Estimate of Fair Value Measurement [Member] \| Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Money market funds	7,021	12,191
Estimate of Fair Value Measurement [Member] \| Money Market Funds [Member] \| Fair Value, Inputs, Level 2 [Member]
Money market funds	0	0
Estimate of Fair Value Measurement [Member] \| Money Market Funds [Member] \| Fair Value, Inputs, Level 3 [Member]
Money market funds	$ 0	$ 0