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Quarterly Data And Share Information (Schedule Of Quarterly Data) (FY) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Data And Share Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 563 | $ 1,135 | $ 1,215 | $ 1,390 | $ 1,171 | $ 1,375 | $ 1,654 | $ 1,475 | $ 1,367 | $ 1,526 | $ 2,562 | $ 4,911 | $ 5,871
Net income (loss) from continuing operations |  | $ (167) | $ (182) | $ 9 | $ (96) | $ (88) | $ 298 | $ 99 | $ 133 |  |  | $ (436) | $ 442
Income (loss) per common share from continuing operations |  | $ (0.01) | $ (0.02) | $ 0 | $ (0.01) | $ (0.01) | $ 0.03 | $ 0.01 | $ 0.01 |  |  |  |

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