Note 5 - Financial Instruments and Fair Value Measurements - Summary of Cash Equivalents' Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Reported Value Measurement [Member]
Total assets	$ 2,193	$ 12,191
Reported Value Measurement [Member] | Fair Value, Recurring [Member]
Derivative liability	212	292
Total liabilities	212	292
Reported Value Measurement [Member] | Money Market Funds [Member]
Money market funds	2,193	12,191
Estimate of Fair Value Measurement [Member]
Total assets	2,193	12,191
Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member]
Derivative liability	212	292
Total liabilities	212	292
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Total assets	2,193	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	212	292
Total liabilities	212	292
Estimate of Fair Value Measurement [Member] | Money Market Funds [Member]
Money market funds	2,193	12,191
Estimate of Fair Value Measurement [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Money market funds	2,193	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