Finance lease obligations (Tables)

12 Months Ended

Dec. 31, 2017

Statement [Line Items]

Disclosure of additional information about leasing activities for lessee [Table Text Block]

		Dec. 31, 2017			Dec. 31, 2016
Total minimum lease payments	$	89,750		$	13,720
Effect of discounting		(5,177	)		(788	)
Present value of minimum lease payments		84,573			12,932
Less: current portion		(18,327	)		(3,172	)
		66,246			9,760
Minimum payments under finance leases
Less than 12 months		20,186			3,508
13-36 months		40,253			6,667
37-60 months		29,311			3,545
More than 60 months		-			-
	$	89,750		$	13,720