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- Roll Forward of Changes in Standardized Measure of Discount Future Cash Flows on Proved Crude Oil, Natural Gas Liquids, and Natural Gas Reserves (Details) (USD $)
 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Changes in the standardized measure of discounted future net cash flows applicable to proved crude oil, natural gas liquids, and natural gas reserves      
Balance, beginning of year $ 307,220,699 $ 283,597,493 $ 228,447,954
Net changes in sales prices and production costs related to future production (73,439,526) (35,184,725) 76,942,613
Changes in estimated future development costs 9,848,614 (566,125) 6,340,123
Sales of oil and gas produced during the period, net of production costs (16,479,934) (19,569,182) (16,187,039)
Net change due to extensions, discoveries, and improved recovery 775,574 0 1,606,122
Net change due to revisions in quantity estimates (23,757,788) 64,817,544 (11,975,496)
Net change due to sales of minerals in place (3,150,277) (34,119,027) 0
Development costs incurred during the period 0 747,656 (2,639,398)
Accretion of discount 45,896,187 41,678,733 22,568,868
Net change in discounted income taxes 58,073,450 10,175,957 (15,026,628)
Net changes in timing of production and other (78,909,327) [1] (4,357,625) [1] (6,479,626) [1]
Balance, end of year $ 226,077,672 $ 307,220,699 $ 283,597,493
[1] The operator has expressed current plans to produce the Delhi Field at lower production rates. The decision to produce these reserves at lower rates over a longer period of time did not materially change the total quantities expected to be recovered, but resulted in a significant reduction in the discounted value of these reserves as of June 30, 2014.