Note 14 - Derivative Financial Instruments (Details Textual) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Derivative, Number of Instruments Held, Total	2		2
Gain (Loss) on Derivative Instruments, Net, Pretax, Total	$ 981		$ 981
Derivative, Gain (Loss) on Derivative, Net, Total	$ 700