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Income taxes (Detail Textuals) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]        
Distribution percentage of Real Estate Investment Trust (REIT) taxable income     90.00%  
Provision for income taxes $ 26 $ 16 $ 23 $ 16