| Schedule of Intangible Assets and Goodwill [Table Text Block] |
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December 31, |
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2015 |
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2014 |
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In operation: |
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Neal Hot Springs, Oregon: |
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Geothermal water and mineral rights |
$ |
625,337
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$ |
625,337
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San Emidio, Nevada: |
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Geothermal water and mineral rights |
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4,825,220
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4,825,220
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Less: accumulated amortization |
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(1,299,119
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) |
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(1,117,434
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) |
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4,151,438
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4,333,123
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Inactive: |
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Raft River, Idaho: |
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Surface water rights |
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146,342
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146,343
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Geothermal water and mineral rights |
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1,281,540
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1,251,540
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Guatemala City, Guatemala: |
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Geothermal water and mineral rights |
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625,000
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625,000
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Gerlach, Nevada: |
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Geothermal water and mineral rights |
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997,000
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997,000
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Crescent Valley, Nevada: |
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Geothermal water and mineral rights |
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451,608
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451,608
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The Geysers, California: |
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Geothermal water rights |
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278,872
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278,872
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San Emidio, Nevada: |
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Surface water rights |
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4,323,520
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4,323,520
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Geothermal water and mineral rights |
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3,440,580
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3,440,580
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Less: prior accumulated amortization |
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(430,072
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) |
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(430,072
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) |
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11,114,390
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11,084,391
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$ |
15,265,828
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$ |
15,417,514
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