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Income Taxes - Reconciliation of Provision for Income Taxes to Income Taxes Computed (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Income Tax Disclosure [Abstract] |  |  |  |
Tax expense at federal statutory rate | [1] | $ (1,577,789) | $ (183,085) | $ 106,374
Statutory depletion carryforward |  | (35,034) | $ (71,292) | $ (127,204)
Change in valuation allowance |  | 848,964 |  |
Effect of graduated rates |  | 64,585 | $ 12,221 | $ (13,841)
Permanent differences |  | 31,904 | $ 44,576 | $ 46,421
Other |  | 6,500 |  |
Total income tax (benefit) expense |  | $ (660,870) | $ (197,499) | $ 11,750
Effective income tax rate |  | (14.00%) | (37.00%) | 4.00%
[1] | The federal statutory rate was 34% for fiscal years ending March 31, 2016, 2015 and 2014

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