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Taxes and operating loss carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Discontinued operations, held-for-sale or disposed by sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Deferred tax assets, operating loss carryforwards | $ 1.3 | $ 1.9

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