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Note 9 - Stock Based Compensation (Details Textual) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Feb. 17, 2015
Share-based Payment Arrangement, Expense | $ 146 | $ 94 |
Share Based Compensation Expense, Estimated Future Compensation, Total | 1,100 |  |
Share Based Compensation Expense, Estimated For Remainder of Fiscal Year | 407 |  |
Share Based Compensation Expense, Estimated For Year One | 435 |  |
Share Based Compensation Expense, Estimated For Year Two | 262 |  |
Share Based Compensation Expense, Estimated For Year Three | $ 38 |  |
2015 Stock Option and Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  | 250,000
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) | 17,716 | 13,243 |
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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