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Consolidated Statements of Operations - USD ($)
 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Revenues      
Total revenues $ 27,841,265 $ 17,673,508 $ 21,349,920
Operating costs      
Depreciation, depletion and amortization 3,615,737 1,228,685 1,300,207
Accretion of discount on asset retirement obligations 34,866 41,626 72,312
General and administrative expenses [1] 6,256,783 8,388,291 7,495,309
Restructuring charges [2] (5,431) 1,293,186 0
Total operating costs 19,257,568 12,145,361 10,648,566
Income from operations 8,583,697 5,528,147 10,701,354
Other      
(Loss) on derivative instruments, net (109,974) 0 0
Interest income 35,991 30,256 22,580
Interest (expense) (73,636) (69,092) (65,745)
Income before income tax provision 8,436,078 5,489,311 10,658,189
Income tax provision 3,444,221 1,891,998 4,029,761
Net income attributable to the Company 4,991,857 3,597,313 6,628,428
Dividends on preferred stock 674,302 674,302 674,302
Net income attributable to common shareholders $ 4,317,555 $ 2,923,011 $ 5,954,126
Earnings per common share      
Basic (in dollars per share) $ 0.13 $ 0.09 $ 0.21
Diluted (in dollars per share) $ 0.13 $ 0.09 $ 0.19
Weighted average number of common shares outstanding      
Basic (in shares) 32,817,456 30,895,832 28,205,467
Diluted (in shares) 32,924,018 32,564,067 31,975,131
Delhi Field      
Revenues      
Total revenues $ 27,573,641 $ 16,908,666 $ 19,219,036
Operating costs      
Production costs 8,516,323 0 0
Artificial Lift Technology      
Revenues      
Total revenues 247,255 623,332 375,063
Operating costs      
Production costs 743,802 609,221 390,238
Other Property      
Revenues      
Total revenues 20,369 141,510 1,755,821
Operating costs      
Production costs $ 95,488 $ 584,352 $ 1,390,500
[1] General and administrative expenses for the years ended June 30, 2015, 2014 and 2013 included non-cash stock-based compensation expense of $943,653, $1,352,322, and $1,531,745, respectively.
[2] Restructuring charges for the year ended June 30, 2014 included non-cash stock-based compensation expense of $376,365.