Note 4 - Fair Value Measurements and Derivative Financial Instruments - Financial Liabilities Measured at Fair Value on Recurring Basis (Details) - Interest Rate Swap [Member] - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Other assets	$ 3,373	$ 288
Fair Value, Inputs, Level 1 [Member]
Other assets	0	0
Fair Value, Inputs, Level 2 [Member]
Other assets	3,373	288
Fair Value, Inputs, Level 3 [Member]
Other assets	$ 0	$ 0