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Note 1 - Organization and Basis for Presentation (Details Textual)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Number of Operating Segments 1    
Operating Lease, Liability, Total $ 6,421    
Operating Lease, Right-of-Use Asset $ 6,008  
Accounting Standards Update 2016-02 [Member]      
Operating Lease, Liability, Total   $ 7,000  
Operating Lease, Right-of-Use Asset   6,500  
Accrued Rent   $ (500)  
Minimum [Member]      
Period of Payments Received from Customers 30 days    
Maximum [Member]      
Period of Payments Received from Customers 60 days