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Note 10 - Developments in Accounting Pronouncements (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Lease, Liability, Total $ 17,330 $ 22,400  
Operating Lease, Right-of-Use Asset $ 17,313 $ 22,400 $ 0