Note 3 - Fair Value Measurements - Fair Value of Assets and Liabilities on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Derivatives	$ 8	$ 1,376
Money Market Funds [Member]
Money market funds	4,000,000
Fair Value, Inputs, Level 1 [Member]
Derivatives	0	0
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Money market funds	4,000,000
Fair Value, Inputs, Level 2 [Member]
Derivatives	0	0
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Money market funds	0
Fair Value, Inputs, Level 3 [Member]
Derivatives	8	$ 1,376
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
Money market funds	$ 0