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General & Administrative Expenses, Valuation of stock compensation (Details) | 1 Months Ended | 12 Months Ended
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Jun. 30, 2021 shares | Jun. 30, 2020 shares | May 31, 2020 shares $ / shares | Jan. 31, 2020 shares | May 31, 2019 shares $ / shares | Mar. 31, 2019 shares | Jan. 31, 2019 shares | Dec. 31, 2020 shares | Dec. 31, 2019 shares | Dec. 31, 2018 shares
Valuation of Stock Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock, vested (in shares) | [1] |  |  |  |  |  |  |  | 550,002 | 755,500 | 1,085,331
January 2020 [Member] | Management [Member] |  |  |  |  |  |  |  |  |  |  |
Valuation of Stock Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock awarded (in shares) |  |  |  |  | 660,000 |  |  |  |  |  |
Number of restricted stock vesting in one year (in shares) |  |  |  |  | 253,334 |  |  |  |  |  |
Number of restricted stock vesting in two years (in shares) |  |  |  |  | 53,333 |  |  |  |  |  |
Number of restricted stock vesting in three years (in shares) |  |  |  |  | 153,333 |  |  |  |  |  |
Number of restricted stock, vested subject to certain market conditions (in shares) |  |  |  | 200,000 |  |  |  |  |  |  |
Number of shares vested, fair value (in dollars per share) | $ / shares |  |  |  | $ 3.5637 |  |  |  |  |  |  |
January 2020 [Member] | Broad of Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Valuation of Stock Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock awarded (in shares) |  |  |  |  | 150,000 |  |  |  |  |  |
Number of restricted stock, vested (in shares) |  |  | 30,000 |  |  |  |  |  |  |  |
January 2020 [Member] | Broad of Directors [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Valuation of Stock Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock, vested (in shares) |  | 120,000 |  |  |  |  |  |  |  |  |
January 2019 [Member] | Management [Member] |  |  |  |  |  |  |  |  |  |  |
Valuation of Stock Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock awarded (in shares) |  |  |  |  |  |  |  | 560,000 |  |  |
Number of restricted stock vesting in one year (in shares) |  |  |  |  |  |  |  | 120,000 |  |  |
Number of restricted stock vesting in two years (in shares) |  |  |  |  |  |  |  | 120,000 |  |  |
Number of restricted stock vesting in three years (in shares) |  |  |  |  |  |  |  | 120,000 |  |  |
Number of restricted stock, vested subject to certain market conditions (in shares) |  |  |  |  |  | 200,000 |  |  |  |  |
Number of shares vested, fair value (in dollars per share) | $ / shares |  |  |  |  |  | $ 3.04 |  |  |  |  |
March 2019 [Member] | Broad of Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Valuation of Stock Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of restricted stock awarded (in shares) |  |  |  |  |  |  | 210,000 |  |  |  |
[1] | Does not include shares in lieu of dividends

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