Restricted cash

12 Months Ended

Dec. 31, 2012

Restricted Cash

Restricted cash

Restricted cash consists of US dollar money market securities (plus accrued interest) which have been deposited by NXT with financial institutions as security in order for these institutions to issue bank letters of credit for the benefit of third party clients.   These letters of credit include contractual performance bonds related to conducting certain SFD® surveys.

	2012			2011
Total restricted cash	$	433,369		$	74,135
Less current portion, amounts scheduled to be released to NXT within 12 months		(433,369	)		-
	$	-		$	74,135