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Note 12 - Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - Interest Rate Swap [Member] - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Derivative liabilities $ 0  
Fair Value, Recurring [Member]    
Derivative liabilities   $ (603)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Derivative liabilities   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivative liabilities   (603)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivative liabilities   $ 0