XML 83 R29.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Oil and Gas Reserve Data (Tables) | 12 Months Ended
--- | ---
Mar. 31, 2013
Extractive Industries [Abstract] |
Changes in Proved Reserves: |
| Oil (Bbls) |  | Natural Gas (Mcf)
Proved Developed and Undeveloped Reserves: |  |  |
As of April 1, 2010 | 240,000 |  | 8,405,000
| Revision of previous estimates | 22,000 |  | 130,000
| Purchase of minerals in place | 45,000 |  | 545,000
| Extensions and discoveries | - |  | 136,000
| Sales of minerals in place | - |  | -
| Production | (17,000) |  | (459,000)
As of March 31, 2011 | 290,000 |  | 8,757,000
| Revision of previous estimates | 33,000 |  | (183,000)
| Purchase of minerals in place | 19,000 |  | -
| Extensions and discoveries | 23,000 |  | 267,000
| Sales of minerals in place | - |  | -
| Production | (19,000) |  | (396,000)
As of March 31, 2012 | 346,000 |  | 8,445,000
| Revision of previous estimates | (10,000) |  | (589,000)
| Purchase of minerals in place | 48,000 |  | 71,000
| Extensions and discoveries | 5,000 |  | 318,000
| Sales of minerals in place | - |  | -
| Production | (23,000) |  | (401,000)
As of March 31, 2013 | 366,000 |  | 7,844,000
Summary of Proved Developed and Undeveloped Reserves |
| Oil (Bbls) |  | Natural Gas (Mcf)
Proved Developed Reserves: |  |  |
As of April 1, 2010 | 141,980 |  | 5,017,342
As of March 31, 2011 | 159,975 |  | 4,964,061
As of March 31, 2012 | 194,620 |  | 5,359,670
As of March 31, 2013 | 237,420 |  | 4,807,020
Proved Undeveloped Reserves: |  |  |
As of April 1, 2010 | 98,088 |  | 3,388,248
As of March 31, 2011 | 130,187 |  | 3,792,974
As of March 31, 2012 | 151,730 |  | 3,085,060
As of March 31, 2013 | 128,290 |  | 3,037,180
Progress of Converting Proved Undeveloped Reserves: |
| Oil & Natural Gas |  | Future
| (Mcfe) |  | Development Costs
PUDs, beginning of year | 3,995,462 |  | $ 4,307,550
Revision of previous estimates | (412,155) |  | (185,185)
Conversions to PD reserves | (155,700) |  | (228,198)
Additional PUDs added | 379,334 |  | 647,350
PUDs, end of year | 3,806,941 |  | $ 4,541,517
Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves: |
| March 31
| 2013 |  | 2012 |  | 2011
Future cash inflows | $ 52,900,000 |  | $ 64,783,000 |  | $ 56,413,000
Future production costs and taxes | (14,893,000) |  | (16,031,000) |  | (11,086,000)
Future development costs | (4,850,000) |  | (4,530,000) |  | (4,029,000)
Future income taxes | (6,374,000) |  | (9,920,000) |  | (9,118,000)
Future net cash flows | 26,783,000 |  | 34,302,000 |  | 32,180,000
Annual 10% discount for estimated timing of cash flows | (12,414,000) |  | (14,946,000) |  | (14,528,000)
Standardized measure of discounted future net cash flows | $ 14,369,000 |  | $ 19,356,000 |  | $ 17,652,000
Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves: |
| March 31
| 2013 |  | 2012 |  | 2011
Sales of oil and gas produced, net of production costs | $ (1,982,000) |  | $ (2,298,000) |  | $ (2,119,000)
Net changes in price and production costs | (5,881,000) |  | (375,000) |  | 1,590,000
Changes in previously estimated development costs | 1,150,000 |  | 1,353,000 |  | 830,000
Revisions of quantity estimates | (811,000) |  | 1,344,000 |  | 1,088,000
Net change due to purchases and sales of minerals in place | 1,471,000 |  | 390,000 |  | 1,976,000
Extensions and discoveries, less related costs | 321,000 |  | 1,449,000 |  | 165,000
Net change in income taxes | 2,178,000 |  | (596,000) |  | (1,076,000)
Accretion of discount | 2,495,000 |  | 2,265,000 |  | 1,809,000
Changes in timing of estimated cash flows and other | (3,928,000) |  | (1,828,000) |  | (771,000)
Changes in standardized measure | (4,987,000) |  | 1,704,000 |  | 3,492,000
Standardized measure, beginning of year | 19,356,000 |  | 17,652,000 |  | 14,160,000
Standardized measure, end of year | $ 14,369,000 |  | $ 19,356,000 |  | $ 17,652,000

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | MXC_ChangesInProvedReservesTableTextBlock
Namespace Prefix: | MXC_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | MXC_ChangesInStandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedOilAndGasReservesTableTextBlock
Namespace Prefix: | MXC_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | MXC_ProgressOfConvertingProvedUndevelopedReservesTableTextBlock
Namespace Prefix: | MXC_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | MXC_StandardizedMeasureOfDiscountedFutureNetCashFlowsRelatingToProvedReservesTableTextBlock
Namespace Prefix: | MXC_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | MXC_SummaryOfProvedDevelopedAndUndevelopedReservesTableTextBlock
Namespace Prefix: | MXC_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ExtractiveIndustriesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration