Selected Quarterly Information (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

	For the three months ended
	March 31			June 30			September 30			December 31
	US$ thousands			US$ thousands			US$ thousands			US$ thousands
2018:
Oil and gas sales		-			-			-			-

Net (loss) gain		(6,251	)		(1,241	)		781			(31,800	)

Net (loss) gain per share – basic and diluted		(0.11	)		(0.02	)		0.02			(0.48	)
Weighted-average shares outstanding–basic and diluted (in thousands)		57,504			59,346			61,089			66,135
2017:
Oil and gas sales		-			-			-			-

Net loss		(3,375	)		(4,971	)		(1,462	)		(181	)

Net loss per share – basic and diluted		(0.07	)		(0.10	)		(0.03	)		(0.003	)
Weighted-average shares outstanding–basic and diluted (in thousands)		47,237			50,245			53,382			55,598