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Note 8 - Other Liabilities - Other Liabilities, Current and Non-current (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Other accrued compensation $ 1,784 $ 1,139  
Other liabilities, current - Note 8 1,834 3,939 $ 1,790
Warrants and Rights Outstanding 18 18  
Payroll Tax Liability 135 0  
Other liabilities, non-current - Note 8 153 18 $ 18
Restricted Stock Units (RSUs) [Member]      
Accrued compensation 50 1,210  
Phantom Share Units (PSUs) [Member]      
Accrued compensation $ 0 $ 1,590