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Note 12 - Stock Option and Equity Incentive Plans - Future Share-based Compensation Expense (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
2019 $ 530
2020 444
2021 250
2022 30
Total 1,254
Employee and Nonemployee Stock Option [Member]  
2019 28
2020 28
2021
2022
Total 56
Common Stock [Member]  
2019
2020
2021
2022
Total
Restricted Stock Units (RSUs) [Member]  
2019 502
2020 416
2021 250
2022 30
Total $ 1,198