Note 12 - Subsequent Events (Details Textual) - $ / shares |
1 Months Ended | 3 Months Ended | |
|---|---|---|---|
May 04, 2021 |
Mar. 31, 2021 |
Mar. 31, 2020 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) | 39,000 | 162,000 | |
| Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) | $ 1.97 | $ 2.71 | |
| Subsequent Event [Member] | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) | 80,000 | ||
| Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share) | $ 5.98 | ||
| X | ||||||||||
- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
|
| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|