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Quarterly Data And Share Information (Schedule Of Quarterly Data) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Data And Share Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,422 | $ 1,179 | $ 1,318 | $ 1,344 | $ 1,216 | $ 1,242 | $ 1,282 | $ 932 |  |  |
Net income (loss) from continuing operations | $ 132 | $ (315) | $ (178) | $ (213) | $ (260) | $ (908) | $ (1,627) | $ (1,404) | $ (574) | $ (4,199) | $ (24,721)
Loss per common share from continuing operations | $ 0.02 | $ (0.03) | $ (0.02) | $ (0.03) | $ (0.04) | $ (0.15) | $ (0.27) | $ (0.23) | $ (0.06) | $ (0.69) | $ (4.06)

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