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Selected Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Information (Details) (USD $)
 3 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Revenues $ 4,310,514 $ 4,337,006 [1] $ 4,392,289 [2] $ 4,633,699 $ 5,399,749 [3] $ 6,010,567 $ 5,648,058 $ 4,291,546 $ 17,673,508 $ 21,349,920 $ 17,962,038
Operating income (loss) 2,364,811 1,357,534 [1] (158,095) [2] 1,963,897 2,351,546 [3] 3,394,531 3,024,721 1,930,556 5,528,147 10,701,354 8,829,274
Net income (loss) available to common shareholders 1,441,469 755,125 [1] (577,459) [2] 1,303,876 944,012 [3] 2,228,467 1,790,696 990,951 2,923,011 5,954,126 4,501,739
Basic net income per share (in dollars per share) $ 0.04 $ 0.02 [1] $ (0.02) [2] $ 0.05 $ 0.03 [3] $ 0.08 $ 0.06 $ 0.04 $ 0.09 $ 0.21 $ 0.16
Diluted net income per share (in dollars per share) $ 0.04 $ 0.02 [1] $ (0.02) [2] $ 0.04 $ 0.03 [3] $ 0.07 $ 0.06 $ 0.03 $ 0.09 $ 0.19 $ 0.14
Restructuring charges     1,300,000           1,293,186 [4] 0 [4] 0 [4]
Non-cash stock-based compensation expense     800,000                
Options and Incentive Warrants, Exercises (in shares)     4,000,000                
Options and Incentive Warrants Outstanding, Beginning of Period (in shares)     4,800,000                
Difference in the actual taxable income and expected book income due to lower revenue                 600,000    
Difference in the actual taxable income and expected book income due to higher general and administrative expense                 400,000    
Officer
                      
Salaries, Wages and Officers' Compensation   $ 608,000                  
[1] Includes $608,000 of non-recurring expenses related to the retirement of an officer of the Company.
[2] Reflects a $1.3 million restructuring charge and $0.8 million of non-recurring expenses primarily associated with the exercise of 4.0 million of 4.8 million of previously outstanding stock options and warrants.
[3] The tax provision for fiscal 2013 reflects a higher effective tax rate compared to the estimated annual effective rate at March 31, 2013. The March effective rate included the favorable effect depletion in excess of basis and was based on the Company's estimate of taxable ordinary income at that time. In contrast to the March forecast, actual taxable income for fiscal 2013 was lower due to a taxable loss on the sale of assets in June 2013 and lower than expected book income due to $0.6 million of lower Delhi Field revenue and $0.4 million of higher general and administrative expense, primarily attributable to an increase in accrued bonus, shelf registration costs and an engineering study.
[4] Restructuring charges for the year ended June 30, 2014 included non-cash stock-based compensation expense of $376,365.