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Note 3 - Business Combination - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 21, 2018
Goodwill $ 15,682 $ 15,682 $ 15,682  
CVie Investments [Member]        
Cash and cash equivalents       $ 193
Restricted cash       31
Prepaid expenses and other current assets       387
Property and equipment, net       76
Intangible assets       77,090
Total identifiable assets acquired       77,777
Current liabilities       (2,590)
Loans payable, current       (7,944)
Deferred tax liabilities, noncurrent       (15,418)
Other liabilities, noncurrent       (7)
Net identifiable assets acquired       51,818
Goodwill       15,682
Net assets acquired       $ 67,500