Note 8 - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019	Jan. 01, 2019
Operating Lease, Liability, Total	$ 21,117	$ 21,117		$ 19,508
Operating Lease, Right-of-Use Asset	19,067	19,067	$ 15,980	$ 17,613
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		4,380
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 473	$ 2,253