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Note 10 - Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Equity securities - common stock $ 1,704 $ 3,511
Interest Rate Swap [Member]    
Derivative liabilities 0 (199)
Fair Value, Inputs, Level 1 [Member]    
Equity securities - common stock 1,704 3,511
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]    
Derivative liabilities 0 0
Fair Value, Inputs, Level 2 [Member]    
Equity securities - common stock 0 0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]    
Derivative liabilities   (199)
Fair Value, Inputs, Level 3 [Member]    
Equity securities - common stock 0 0
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]    
Derivative liabilities $ 0 $ 0