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Note 6 - Share-based Compensation - Compensation Cost (Details) - Selling, General and Administrative Expenses [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Allocated share based compensation $ 239 $ 473 $ 1,338 $ 1,169
Common Stock [Member]        
Allocated share based compensation 100 100 300 300
Employee and Nonemployee Stock Option [Member]        
Allocated share based compensation 59 60 173 91
Restricted Stock Units (RSUs) [Member]        
Allocated share based compensation $ 80 $ 313 $ 865 $ 778