Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies [Abstract]

Minimum Future Rental Payments

Year Ending December 31,	U.S. Dollars
2016		1,374
2017		619
2018		120
Thereafter		90
		2,203

Allowance For Doubtful Accounts

	Balance at										Balance at
	beginning				Reversal of			Write-off of			end of
	of period		Provision		provision			provision			period
	U.S. Dollars
2013		1,323		272		(218	)		(16	)		1,361
2014		1,361		344		(164	)		(15	)		1,526
2015		1,526		215		(141	)		(8	)		1,592