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Acquisitions (Details 1) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Acquisitions |  |
Revenues | $ 24,123 | $ 20,867
Net income (loss) operations | $ (12,671) | $ (487)
Earning per share attributiable | $ (0.64) | $ (0.03)

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- Definition Revenue earned during the period by the entity for rights granted to another party under coal mineral leases. + References No definition available. + Details
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