9. Income Tax (Details 2) (USD $)	Mar. 31, 2014	Mar. 31, 2013
Deferred tax assets:
Statutory depletion carry-forward	$ 2,190,000	$ 1,467,000
Other accruals	103,000	131,000
Allowance for doubtful accounts	5,000	14,000
Gross deferred tax assets	2,298,000	1,612,000
Deferred tax liabilities:
Depreciation, depletion and intangible drilling costs	(6,784,000)	(4,583,000)
Gross deferred tax liabilities	(6,784,000)	(4,583,000)
Net deferred tax liabilities	$ (4,486,000)	$ (2,971,000)