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Equity - Stock Options - Valuation assumptions (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 28, 2021 | Jan. 22, 2021 | Jan. 31, 2019 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based compensation |  |  |  |  |  |  |
Exercise price (in dollars per share) | $ 4.15 | $ 3.97 |  |  |  |  |
Equity Incentive Plan |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 258,618 |
Non-vested stock options |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Contractual life |  |  |  |  |  | 10 years |
Vesting period |  |  |  |  |  | 2 years |
Fair value of options granted (in dollars) |  |  |  |  |  | $ 176,000 |
Compensation expense |  |  |  | $ 0 | $ 13,000 | $ 13,000 | $ 26,000
Non-vested stock options | Minimum [Member] |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  |  | $ 1.16 |
Non-vested stock options | Maximum [Member] |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  |  | $ 2.25 |
Non-vested stock options | Non-Qualified Stock Option [Member] |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 341,382 |
Stock options | Chief Executive Officer [Member] | Non-vested stock options |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |
Granted (in shares) |  |  | 600,000 |  |  | 600,000 |

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