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Note 8 - Accrued Expenses - Activity and Liability Balances Related to Restructuring Costs (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Liability, beginning balance $ 44 $ 44
New charges 128  
Cash payment and other settlements (128)  
Employee Severance [Member]    
Liability, beginning balance
New charges 128  
Cash payment and other settlements (128)  
Other Restructuring [Member]    
Liability, beginning balance 44 $ 44
New charges  
Cash payment and other settlements