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Note 14 - Fair Value Of Financial instruments - Financial Instruments Measured at Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Lease Guarantees $ (378) $ (482)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Lease Guarantees 0 0
Derivatives (1) [1] 0 0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Lease Guarantees 0 0
Derivatives (1) [1] (3,877) (154)
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Lease Guarantees (378) (482)
Derivatives (1) [1] $ 0 $ 0
[1] Interest rate swaps are valued based on observable market swap rates and are classified within Level 2 of the fair value hierarchy.