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Note 6 - Share-based Compensation - Compensation Cost (Details) - Selling, General and Administrative Expenses [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Allocated share based compensation $ 562 $ 401 $ 1,098 $ 696
Common Stock [Member]        
Allocated share based compensation 100 100 200 200
Employee and Nonemployee Stock Option [Member]        
Allocated share based compensation 54 24 113 32
Restricted Stock Units (RSUs) [Member]        
Allocated share based compensation $ 408 $ 277 $ 785 $ 464