Oil and Gas Concessions, Current Rights (Details)	12 Months Ended
	Sep. 30, 2015 USD ($)
JDZ 2 [Member]
Sao Tome Concession Current Rights [Abstract]
ERHC Original Participating Interest	30.00%
ERHC Joint Bid Participating Interest	35.00%
Participating interest(s) transferred	43.00%
Current ERHC Retained Participating Interest	22.00%
Remaining Cost Allocated to Blocks	$ 0
JDZ 2 [Member] | Sinopec [Member]
Sao Tome Concession Current Rights [Abstract]
Allocation of cost oil to the company	100.00%
Allocation profit recoverable by joint interest participant	50.00%
Carried cost recoverable by well operators	100.00%
JDZ 3 [Member]
Sao Tome Concession Current Rights [Abstract]
ERHC Original Participating Interest	20.00%
ERHC Joint Bid Participating Interest	5.00%
Participating interest(s) transferred	15.00%
Current ERHC Retained Participating Interest	10.00%
Remaining Cost Allocated to Blocks	$ 0
JDZ 3 [Member] | Addax [Member]
Sao Tome Concession Current Rights [Abstract]
Allocation of cost oil to the company	100.00%
Allocation profit recoverable by joint interest participant	50.00%
Carried cost recoverable by well operators	100.00%
JDZ 4 [Member]
Sao Tome Concession Current Rights [Abstract]
ERHC Original Participating Interest	25.00%
ERHC Joint Bid Participating Interest	35.00%
Participating interest(s) transferred	40.50%
Current ERHC Retained Participating Interest	19.50%
Remaining Cost Allocated to Blocks	$ 0
JDZ 5 [Member]
Sao Tome Concession Current Rights [Abstract]
ERHC Original Participating Interest	15.00%
ERHC Joint Bid Participating Interest	0.00%
Participating interest(s) transferred	0.00%
Current ERHC Retained Participating Interest	15.00%
Remaining Cost Allocated to Blocks	$ 567,900
JDZ 6 [Member]
Sao Tome Concession Current Rights [Abstract]
ERHC Original Participating Interest	15.00%
ERHC Joint Bid Participating Interest	0.00%
Participating interest(s) transferred	0.00%
Current ERHC Retained Participating Interest	15.00%
Remaining Cost Allocated to Blocks	$ 567,900
JDZ 9 [Member]
Sao Tome Concession Current Rights [Abstract]
ERHC Original Participating Interest	20.00%
ERHC Joint Bid Participating Interest	0.00%
Participating interest(s) transferred	0.00%
Current ERHC Retained Participating Interest	20.00%
Remaining Cost Allocated to Blocks	$ 567,900
EEZ 4 [Member]
Sao Tome Concession Current Rights [Abstract]
ERHC Original Participating Interest	100.00%
ERHC Joint Bid Participating Interest	0.00%
Participating interest(s) transferred	0.00%
Current ERHC Retained Participating Interest	100.00%
Remaining Cost Allocated to Blocks	$ 567,900
EEZ 11 [Member]
Sao Tome Concession Current Rights [Abstract]
ERHC Original Participating Interest	100.00%
ERHC Joint Bid Participating Interest	0.00%
Participating interest(s) transferred	0.00%
Current ERHC Retained Participating Interest	100.00%
Remaining Cost Allocated to Blocks	$ 842,195