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Oil and Gas Reserve Data - Changes in Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves: (Details) (USD $)
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Extractive Industries [Abstract]      
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