Note 7 - Fair Value Measurements - Fair Value Hierarchy for Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Corporate, municipal debt and treasury securities	$ 5,575	$ 5,410
Total assets	21,924
Corporate Debt Securities [Member]
Corporate, municipal debt and treasury securities	5,575
Money Market Funds [Member]
Money market accounts	16,349
Fair Value, Inputs, Level 1 [Member]
Total assets	21,924
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Corporate, municipal debt and treasury securities	5,575
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Money market accounts	$ 16,349