Note 3 - Financial Instruments and Fair Value Measurements - Summary of Cash Equivalents' Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Reported Value Measurement [Member]
Total assets	$ 2,797	$ 1,819
Reported Value Measurement [Member] | Money Market Funds [Member]
Fair value	2,797	1,819
Estimate of Fair Value Measurement [Member]
Total assets	2,797	1,819
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Total assets	2,797	1,819
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 3 [Member]
Total assets	0	0
Estimate of Fair Value Measurement [Member] | Money Market Funds [Member]
Fair value	2,797	1,819
Estimate of Fair Value Measurement [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value	2,797	1,819
Estimate of Fair Value Measurement [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value	0	0
Estimate of Fair Value Measurement [Member] | Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value	$ 0	$ 0