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] - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Other Assets [Member]
Notional Amount	$ 132,469
Fair Value	$ 3,167
Other Noncurrent Liabilities [Member]
Notional Amount		$ 133,313
Fair Value		$ 288