Note 12 - Employee Benefit Plan (Details Textual) - USD ($) |
12 Months Ended | 24 Months Ended | |
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2018 |
|
| Note To Financial Statement Details Textual | |||
| Defined Contribution Plan, Non-elective Safe Harbor Contribution, Percentage of Annual Salary | 3.00% | ||
| Defined Contribution Plan, Non-elective Safe Harbor Contribution, Amount | $ 49,000 | $ 54,000 | |