Note 2 - Recently Issued Accounting Standards (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 449,084		$ 433,126
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ (100)