Note 15 - Fair Value of Financial instruments - Financial Instruments Measured at Fair Value (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
Derivatives (1)	[1]	$ 0	$ 0
Fair Value, Inputs, Level 2 [Member]
Derivatives (1)	[1]	(2,275)	(2,834)
Fair Value, Inputs, Level 3 [Member]
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.