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16. Oil and Gas Reserve Data - Changes in Standardized Measurement (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Extractive Industries [Abstract] |  |  |
Sales of oil and gas produced, net of production costs | $ (2,036,000) | $ (2,762,000) | $ (1,982,000)
Net changes in price and production costs | (4,066,000) | 2,464,000 | (5,881,000)
Changes in previously estimated development costs | 2,627,000 | 270,000 | 1,150,000
Revisions of quantity estimates | (3,718,000) | (657,000) | (811,000)
Net change due to purchases and sales of minerals in place | 2,777,000 | 1,332,000 | 1,471,000
Extensions and discoveries, less related costs | 4,607,000 | 3,802,000 | 321,000
Net change in income taxes | 654,000 | (1,997,000) | 2,178,000
Accretion of discount | 2,474,000 | 1,779,000 | 2,495,000
Changes in timing of estimated cash flows and other | (3,710,000) | 729,000 | (3,928,000)
Changes in standardized measure | (391,000) | 4,960,000 | (4,987,000)
Standardized measure, beginning of year | 19,329,000 | 14,369,000 | 19,356,000
Standardized measure, end of year | $ 18,938,000 | $ 19,329,000 | $ 14,369,000

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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery of proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62500-109447 + Details
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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in estimated future development costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 31 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62455-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62500-109447 + Details
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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of change in the estimated future income tax on future pretax net cash flows related to the entity's proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62500-109447 + Details
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- Definition Amount of (increase) decrease in standardized measure of discounted future net cash flow as a result of sales and transfers of oil and gas produced. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62500-109447 + Details
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- Definition Amount of increase (decrease) in standardized measure of discounted future net cash flow relating to proved oil and gas reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=51678428&loc=d3e62500-109447 + Details
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