Note 10 - Shareholders' Equity (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | |
|---|---|---|---|
Mar. 31, 2021 |
Jun. 30, 2022 |
Jun. 30, 2021 |
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) | (0) | ||
| Proceeds from Stock Options Exercised | $ 0 | $ 244,000 | |
| Stock Issued During Period, Shares, Exercise of Common Stock Warrants (in shares) | 0 | ||
| Common Stock [Member] | |||
| Stock Issued During Period, Shares, New Issues (in shares) | 0 | ||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) | 40,000 | 40,000 | |
| Proceeds from Stock Options Exercised | $ 244,000 | ||
| X | ||||||||||
- Definition The number of shares issued during the period due to the exercise of common stock warrants. No definition available.
|
| X | ||||||||||
- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Number of new stock issued during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|