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Accounts payable and accrued liabilities (Tables)
12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Accounts payable and accrued liabilities
Accounts payable and accrued liabilities include the following at December 31, 2018 and 2017:
 
 
2018
 
2017
Accounts payable
 
$
366,917

 
$
1,089,919

Accrued payroll including vacation
 
223,481

 
364,368

Accrued professional fees and contract services
 
185,992

 
443,178

Accrued taxes
 
23,678

 
240,880

Accrued construction costs
 
13,716

 
509,950

Accrued other
 
31,539

 
18,560

Accounts payable and accrued liabilities
 
$
845,323

 
$
2,666,855