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16. Oil and Gas Reserve Data - Changes in Standardized Measurement (Details) - USD ($)
 12 Months Ended
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