Note 4 - Fair Value Measurements - Fair Value of Assets and Liabilities on a Recurring Basis (Details) - Fair Value, Recurring [Member] - Money Market Funds [Member] - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Money market funds	$ 200,000	$ 300,000
Fair Value, Inputs, Level 1 [Member]
Money market funds	200,000	300,000
Fair Value, Inputs, Level 2 [Member]
Money market funds	0	0
Fair Value, Inputs, Level 3 [Member]
Money market funds	$ 0	$ 0