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Note 11 - Stock Option and Equity Incentive Plans - Future Share-based Compensation Expense (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
2018 $ 414
2019 302
2020 215
2021 21
Total 952
Employee and Nonemployee Stock Option [Member]  
2018 44
2019 28
2020 28
2021
Total 100
Common Stock [Member]  
2018
2019
2020
2021
Total
Restricted Stock Units (RSUs) [Member]  
2018 370
2019 274
2020 187
2021 21
Total $ 852