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Note 9 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 2,168 |  |  |  | $ 2,168 |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  |  |  | 3 years 36 days |
Share-based Payment Arrangement, Amount Capitalized |  |  |  |  | $ 0 | $ 0
Restricted Stock [Member] |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ 213 |  | $ 171 |  | 396 | 292
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  |  | $ 292 | 238
Restricted Stock [Member] | Employees [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 4 years |
Restricted Stock [Member] | Independent Directors [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 1 year |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 36,000 |  | 32,000 |  |
Share-based Payment Arrangement, Expense |  |  |  |  | $ 257 | $ 270
Restricted Stock [Member] | Independent Directors [Member] | Share-based Compensation Award, Tranche Four [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  | 25.00% |
Restricted Stock [Member] | Independent Directors [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  | 25.00% |
Restricted Stock [Member] | Independent Directors [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  | 25.00% |
Restricted Stock [Member] | Independent Directors [Member] | Share-based Payment Arrangement, Tranche Three [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  | 25.00% |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  | 4 years |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period |  |  |  |  | 10 years |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  | $ 2.78 | $ 3.52

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