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K. QUARTERLY DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 159 | $ 194 | $ 243 | $ 195 |  |  |  |  | $ 157 | $ 232 | $ 259 | $ 172 | $ 791 | $ 764 | $ 820
Operating (expense) | (261) | (254) | (256) | (256) | $ (327) | $ (295) | $ (233) | $ (396) | (363) | (527) | (440) | (470) | (4,061) | (1,533) | (5,122)
Corporate general and administrative expense | (91) | (95) | (122) | (100) | (33) | (52) | (101) | (166) | (120) | (176) | (155) | (154) | (408) | (352) | (605)
Gain on prepayment of debt |  |  |  |  | 888 | 0 | 0 | 0 |  |  |  |  | 0 | 888 | 0
Gain on sale of land |  |  |  |  | 50 | 0 | 0 | 0 |  |  |  |  | 0 | 50 | 0
Impairment of natural gas and oil properties | (2,626) | 0 | 0 | 0 |  |  |  |  | (2,717) | 0 | 0 | 0 | (2,626) | 0 | (2,717)
Recovery of bad debt |  |  |  |  |  |  |  |  | 0 | 306 | 386 | 738 | 0 | 0 | 1,430
Other income (expense) net | (30) | 65 | 11 | (11) | (80) | (13) | (7) | (10) | (10) | (14) | (24) | (34) | 29 | 813 | 1,348
Net income (loss) from continuing operations | (2,849) | (90) | (124) | (172) | 738 | (170) | (171) | (353) | (3,053) | (179) | 26 | 252 | (3,241) | 44 | (2,954)
Net income (loss) from discontinued operations | (2) | (11) | (11) | 13 | (97) | 6 | 38 | 57 | 82 | 104 | 84 | 62 | (5) | 4 | 332
Income (loss) allocable to common shareholders | $ (2,851) | $ (101) | $ (135) | $ (159) | $ 641 | $ (164) | $ (133) | $ (296) | $ (2,971) | $ (75) | $ 110 | $ 314 | $ (3,246) | $ 48 | $ (2,622)
Income (loss) per common share - basic | $ (1.39) | $ (0.05) | $ (0.07) | $ (0.08) | $ 0.32 | $ (0.08) | $ (0.07) | $ (0.15) | $ (1.53) | $ (0.04) | $ 0.06 | $ 0.16 |  |  |

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