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Note 10 - Stock Based Compensation (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Feb. 27, 2015
Share-based Payment Arrangement, Expense | $ 233 | $ 104 |  |  |  |
Share Based Compensation Expense, Estimated Future Compensation, Total |  |  | $ 478 |  |  |
Share Based Compensation Expense, Estimated For Remainder of Fiscal Year |  |  | 68 |  |  |
Share Based Compensation Expense, Estimated For Year Two |  |  | 242 |  |  |
Share Based Compensation Expense, Estimated For Year Three |  |  | 149 |  |  |
Share Based Compensation Expense, Estimated For Year Four |  |  | $ 19 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 7,407 |  | 4,433 |
2015 Stock Option and Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  | 250,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 0 | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance | 0 |  | 0 |  |  |
2015 Stock Option and Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 7,407 | 4,433 |  |
2015 Stock Option and Incentive Plan [Member] | Restricted Stock [Member] | Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |  |  |
2015 Stock Option and Incentive Plan [Member] | Restricted Stock [Member] | Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 5 years |  |  |

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