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Note 1 - Basis of Presentation and Accounting Policies (Details Textual) - USD ($)
$ in Thousands
Jan. 01, 2019
Sep. 30, 2019
Dec. 31, 2018
Operating Lease, Right-of-Use Asset   $ 16,296
Operating Lease, Liability, Total   $ 16,752  
Accounting Standards Update 2016-02 [Member]      
Operating Lease, Right-of-Use Asset $ 20,700    
Operating Lease, Liability, Total 21,000    
Accounting Standards Update 2018-02 [Member]      
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect $ 500