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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based compensation $ 272 $ 206 $ 963 $ 842
Common Stock [Member]        
Share-based compensation 100 100 405 405
Employee and Nonemployee Stock Option [Member]        
Share-based compensation 9 4 143 130
Restricted Stock Units (RSUs) [Member]        
Share-based compensation $ 163 $ 102 $ 415 $ 307