Note 13 - Derivative Financial Instruments - Summary of Fair Value Amounts of Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative assets	$ 349	$ 3,648
Derivative liabilities	5,646	1,929
Net derivative assets (liabilities)	(5,297)	1,719
Designated as Hedging Instrument [Member]
Derivative assets	349	3,648
Derivative liabilities	5,646	1,885
Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]
Derivative assets	349	3,648
Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivative liabilities	5,646	1,885
Not Designated as Hedging Instrument [Member]
Derivative assets	0	0
Derivative liabilities	0	44
Not Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivative assets	0	0
Not Designated as Hedging Instrument [Member] | Accrued Expense [Member]
Derivative liabilities	$ 0	$ 44