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Note 10 - Stock Based Compensation (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Feb. 17, 2015
Share-based Payment Arrangement, Expense | $ 94 | $ 71 |  |
Share Based Compensation Expense, Estimated Future Compensation, Total | 902 |  |  |
Share Based Compensation Expense, Estimated For Remainder of Fiscal Year | 322 |  |  |
Share Based Compensation Expense, Estimated For Year Two | 339 |  |  |
Share Based Compensation Expense, Estimated For Year Three | 209 |  |  |
Share Based Compensation Expense, Estimated For Year Four | $ 32 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 13,243 |  | 7,407 |
2015 Stock Option and Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  | 250,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 0 | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | 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 (in shares) | 13,243 | 7,407 |  |
2015 Stock Option and Incentive Plan [Member] | Restricted Stock [Member] | Minimum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 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 (Year) | 5 years |  |  |

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