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Stock-based compensation (Details Textual) - USD ($)		3 Months Ended					12 Months Ended
	May. 16, 2014	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Class of Warrant or Right, Outstanding		30,000					30,000
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 0.63					$ 0.63
Stock Issuance Date		Jan. 11, 2016	Oct. 12, 2015	Jul. 10, 2015	Apr. 13, 2015	Jan. 08, 2015
Stock Issued During Period, Shares, New Issues		83,334	83,334	83,334	83,334	83,334
Stock Issued During Period Per Share Value Of New Issues		$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.15
Stock Issued During Period, Value, New Issues		$ 12,500	$ 12,500	$ 12,500	$ 12,500	$ 12,500
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		175,000				200,000	175,000	200,000	0
Allocated Share-based Compensation Expense								$ 15,000
Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award							July 2014
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date	May 15, 2019
Four Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	25,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 0.17
Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted	100,000
Two Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock Issued During Period, Shares, New Issues		41,667	41,667	41,667	41,667	41,667
Stock Issued During Period, Value, New Issues		$ 12,500

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Date the equity-based award expires, in CCYY-MM-DD format.

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Net number of non-option equity instruments granted to participants.

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