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Note 2 - Fair Value Measurements - Fair Value, Assets Measured on Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Derivatives $ 1,376 $ 13,833
Fair Value, Inputs, Level 1 [Member]    
Derivatives 0 0
Fair Value, Inputs, Level 2 [Member]    
Derivatives 0 0
Fair Value, Inputs, Level 3 [Member]    
Derivatives $ 1,376 $ 13,833