Fair Value Measurement (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value Measurement [Abstract]

Summary of fair value measurement three categories

	Fair value measurements using input type
	September 30, 2015
	U.S. Dollars (in thousands)
	Level 1		Level 2		Level 3			Total
Segregated client cash accounts	$	1,964	$	-	$	-		$	1,964
Restricted cash		41		-		-			41
Financial liabilities		-		-		(497	)		(497	)
	$	2,005	$	-	$	(497	)	$	1,508

Summary of fair value measurement Level 3 Roll-Forward

Liabilities	December 31, 2014		Net realized / unrealized gain		Issuance			Transfers out of (into) Level 3		Settlements (realized gain)		September 30,  2015			Unrealized gain- still held
	U.S. Dollars (in thousands)
Derivative options based on commodities	$	-	$	130	$	(155	)	$	-	$	110	$	(25	)	$	20
Derivative options based on exchange differences		-		551		(656	)		-		466		(105	)		85
Derivative options based on equity shares		-		1,930		(2,297	)		-		1,630		(367	)		300
Total	$	-	$	2,611	$	(3,108	)	$	-	$	2,206	$	(497	)	$	405

Summary of valuation techniques and inputs for Level 3 fair value measurements

Liabilities	Fair value		Methodology	Input	Weighted Average
	U.S. Dollars (in thousands)
Derivative options based on commodities	$	25	Cash or	Expected volatility		21.8	%
			Nothing- option	Risk-free interest rate		0.01	%
			model	Expected contractual life		0.10
Derivative options based on exchange differences	$	105	Cash or	Expected volatility		32.5	%
			Nothing- option	Risk-free interest rate		0.01	%
			model	Expected contractual life		0.22
Derivative options based on equity shares	$	367	Cash or	Expected volatility		33.4	%
			Nothing- option	Risk-free interest rate		0.01	%
			model	Expected contractual life		0.22

Summary of ranges of significant unobservable inputs

	Fair value measurements using input type
	December 31, 2014
	U.S. Dollars (in thousands)
	Level 1		Level 2		Level 3		Total
Segregated client cash accounts	$	2,343	$	-	$	-	$	2,343
Restricted cash		42		-		-		42
	$	2,385	$	-	$	-	$	2,385