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Accrued expenses (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Disclosure Accrued Expenses Details Abstract    
Accrued officer salaries $ 4,589,915 $ 4,473,415
Accrued interest 172,015 164,313
Other 703,503 459,053
Accrued expenses $ 5,465,433 $ 5,096,781