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Note 2 - Recently Issued and Adopted Accounting Pronouncements (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Sep. 30, 2019
Retained Earnings (Accumulated Deficit), Ending Balance $ 422,846   $ 594,353 $ 619,690
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 1,900      
Accounting Standards Update 2016-13 [Member]        
Retained Earnings (Accumulated Deficit), Ending Balance   $ (500)