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Stockholders' Equity (Narrative) (Details) - USD ($) |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 13, 2020 | Dec. 30, 2019 | Feb. 25, 2019 | Jan. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  | $ 93,000 | $ 6,391,000 |
Series H Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  |  | 3.50% |  |
Series H Preferred Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Shares issued | 308 |  |  |  |  |  |  |  |
Proceeds from issuance of private placement | $ 3,080,000 |  |  |  |  |  |  |  |
Preferred stock, dividend rate | 3.50% |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Shares issued |  | 1,020,408 | 496,224 |  |  |  |  |  |
Proceeds from issuance of common stock |  | $ 12,500,000 |  |  |  |  |  |  |
Proceeds from issuance of private placement |  |  | $ 6,272,000 |  |  |  |  |  |
Series G Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Shares issued |  |  |  | 533 |  |  |  |  |
Proceeds from issuance of private placement |  |  |  | $ 5,330,000 |  |  |  |  |
Preferred stock, dividend rate |  |  |  | 6.00% | 6.00% | 6.00% | 6.00% | 6.00% | 6.00%
Series F Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  | 6.00% | 6.00% | 6.00% | 6.00% | 6.00%
Directors And Officers [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Stockholders' Equity Note [Line Items] |  |  |  |  |  |  |  |  |
Shares issued |  |  | 286,244 |  |  |  |  |  |

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