Asset Sales and Impairment (Details Textual) (USD $)	1 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Change in Accounting Estimate [Line Items]
Carrying value of inventory			$ 0
Remaining balance of drilling rig parts			0
Net loss incurred in South Pipeline asset		0	(100,000)
Drilling rig [Member]
Change in Accounting Estimate [Line Items]
Impairment charge for equipments held in inventory			400,000
Pipe and other equipment [Member]
Change in Accounting Estimate [Line Items]
Impairment charge for equipments held in inventory	$ 200,000	$ 0	$ 192,000