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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Lease, Right-of-Use Asset $ 10,332  
Operating Lease, Liability, Total 11,849    
Contract with Customer, Liability, Current 1,178   444
Unbilled Receivables, Current $ 19,081   $ 25,545
Accounting Standards Update 2016-02 [Member]      
Operating Lease, Right-of-Use Asset   $ 10,866  
Operating Lease, Liability, Total   $ 11,138