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Note 6 - Prepaid Expenses and Other Current Assets (Details Textual) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Prepaid Expense and Other Assets, Current $ 600 $ 322
Prepaid Broker Commission 19  
Interest and Other Receivables 220 $ 82
Debt Securities [Member]    
Interest and Other Receivables 130  
Completed Fixed Asset Sales [Member]    
Interest and Other Receivables 90  
Allocated Unity Cost [Member]    
Receivables, Net, Current, Total $ 4