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Note 5 - Share-Based Compensation - Compensation Cost (Details) - Selling, General and Administrative Expenses [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Allocated share based compensation $ 473 $ 272 $ 1,169 $ 963
Common Stock [Member]        
Allocated share based compensation 100 100 300 405
Employee and Nonemployee Stock Option [Member]        
Allocated share based compensation 60 9 91 143
Restricted Stock Units (RSUs) [Member]        
Allocated share based compensation $ 313 $ 163 $ 778 $ 415