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Note 5 - Share-based Compensation - Compensation Cost (Details) - Selling, General and Administrative Expenses [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Allocated share based compensation $ 237 $ 209
Common Stock [Member]    
Allocated share based compensation 100 100
Employee and Nonemployee Stock Option [Member]    
Allocated share based compensation 15 9
Restricted Stock Units (RSUs) [Member]    
Allocated share based compensation $ 122 $ 100