Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Schedule of Cash, Cash Equivalents and Restricted Cash

The following table provides a reconciliation of cash, cash equivalents and restricted cash as reported within the consolidated balance sheet that sum to the total of the same such amounts shown in the statement of cash flows.

	For the years ended December 31,
(thousands of dollars)	2017		2016
Cash and cash equivalents	$	4,054	$	3,309
Restricted cash - pledged deposits for performance bonds		3,668		3,964
Cash, cash equivalents and restricted cash shown in the statement of cash flows	$	7,722	$	7,273

Schedule of Financial Instruments Recognized at Fair Value on Recurring Basis

The following table presents information about financial instruments recognized at fair value on a recurring basis as of December 31, 2017 and 2016, and indicates the fair value hierarchy:

	December 31, 2017
(thousands of dollars)	Level 1		Level 2		Level 3		Total
Current Assets
Short-term available-for-sale investments	$	1,361	$	-	$	-	$	1,361
Total current assets recorded at fair value	$	1,361	$	-	$	-	$	1,361
Non-current Assets
Restricted cash	$	3,668	$	-		-	$	3,668
Total non-current assets recorded at fair value	$	3,668	$	-	$	-	$	3,668

	December 31, 2016
(thousands of dollars)	Level 1		Level 2		Level 3		Total
Non-current Assets
Restricted cash		3,964		-		-		3,964
Total assets recorded at fair value	$	3,964	$	-	$	-	$	3,964