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Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Lease, Right-of-Use Asset $ 12,206 $ 4,600 $ 8,800
Operating Lease, Liability, Total $ 11,710 $ 4,600 8,300  
Operating Lease, Right-of-Use Asset, Net     500  
Accounting Standards Update 2016-02 [Member]        
Deferred Rent Credit     (100)  
Prepaid Expense     $ (600)