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Note 3 - Goodwill and Intangible Assets (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Number of Reportable Segments 1  
Number of Reporting Units 3  
Goodwill Impairment, Weighted Percent Used in Discontinued Cash Flow Method 50.00%  
Goodwill Impairment, Weighted Percent Used in Guideline Public Company Method 50.00%  
Goodwill, Impairment Loss $ 0 $ 0
Goodwill, Period Increase (Decrease), Total 0 0
Goodwill, Ending Balance 44,976 44,976
Impairment of Intangible Assets (Excluding Goodwill), Total $ 0 $ 0
Minimum [Member]    
Finite-Lived Intangible Asset, Useful Life 2 years  
Maximum [Member]    
Finite-Lived Intangible Asset, Useful Life 15 years