Note 4 - Fair Value Measurements and Derivative Financial Instruments - Summary of Financial Instruments Designated as Cash Flow Hedges (Details) - Designated as Hedging Instrument [Member] - Interest Rate Swap [Member] - Other Assets [Member] - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Notional Amount	$ 135,000	$ 90,000
Fair Value	$ 40	$ 458

Note 4 - Fair Value Measurements and Derivative Financial Instruments - Summary of Financial Instruments Designated as Cash Flow Hedges (Details) - Designated as Hedging Instrument [Member] - Interest Rate Swap [Member] - Other Assets [Member] - USD ($)
$ in Thousands

Jun. 30, 2019

Dec. 31, 2018

$ 135,000

$ 90,000

Fair Value

$ 40

$ 458