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Loans Payable And Long-Term Debt (Narrative)(Details) (USD $) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 24 Months Ended | 12 Months Ended |
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Apr. 30, 2013 | Jan. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Apr. 30, 2012 | Jan. 31, 2012 | Oct. 31, 2011 | Jul. 31, 2011 | Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2011 | Mar. 18, 2013 Requirement Eliminated, Amended [Member] | Apr. 30, 2013 Wells Fargo [Member] | Apr. 30, 2012 Wells Fargo [Member] | Apr. 30, 2011 Wells Fargo [Member] | Apr. 30, 2013 Eligible Accounts Receivable [Member] | Apr. 30, 2013 Eligible Pre Bill Reserves [Member] | Apr. 30, 2013 Equipment Value [Member] | Apr. 30, 2013 Board Of County Commissioners Of Garrett County [Member] | Apr. 30, 2012 Board Of County Commissioners Of Garrett County [Member] | Apr. 30, 2013 Allegany County, Maryland Site [Member] | Apr. 30, 2012 Allegany County, Maryland Site [Member] | Apr. 30, 2013 Coalfields Regional Industrial Authority, Inc. [Member] | Apr. 30, 2012 Coalfields Regional Industrial Authority, Inc. [Member] | Apr. 30, 2013 First American Financial Bancorp [Member] | Apr. 30, 2012 First American Financial Bancorp [Member] | Apr. 30, 2013 First American Financial Bancorp [Member] item | Apr. 30, 2013 e-Plus Group [Member] item | Apr. 30, 2013 West Virginia Economic Development Authority [Member] | Apr. 30, 2012 West Virginia Economic Development Authority [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,000,000 |  |  |  |  | $ 20,000,000 |  |  |  |  | $ 6,000,000 |  |  |  |  |  |  |
Line of Credit Facility, Expiration Date |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2015 |  |  |  |  |  |  |  | Dec. 31, 2018 |  | Nov. 13, 2017 |  |  |  |  |  |  |
Annual non usage fees and interest payment |  |  |  |  |  |  |  |  |  |  |  |  | 61,000 | 54,158 | 54,002 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of outstanding indebtedness required to be held for security for indebtedness |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advanced rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
LIBOR rate | 0.25% |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on interest rate | 2.625% |  |  |  |  |  |  |  | 2.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Required maximum ratio of total liabilities to tangible net worth under agreement |  |  |  |  |  |  |  |  | 140.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Required minimum ratio of cash flow to fixed charges under agreement |  |  |  |  |  |  |  |  | 125.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio of total liabilities to tangible net worth |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ratio cash flow to fixed charges |  |  |  |  |  |  |  |  | 272.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% |  | 3.00% |  | 2.00% |  |  |  |  |  | 2.00% |
Debt, outstanding balance | 24,749,000 |  |  |  |  |  |  |  | 24,749,000 |  |  |  |  |  |  |  |  |  | 1,290,000 | 1,290,000 | 2,190,000 | 2,234,000 | 3,530,000 | 3,858,000 |  |  |  |  | 6,665,000 | 7,188,000
Loan agreement fixed balloon payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 |  |  |  |  |  |  |
Number of capitalized lease agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 | 5 |  |
Capital lease agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 545,000 | 95,000 | 545,000 | 529,000 | 10,000,000 |
Capital lease obligations incurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 639,000 | 639,000 |  | 568,000 |  |
Capital lease term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48 months |  |  | 51 months |  |
Market interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.50% |  | 6.50% | 6.50% |  |
Capital lease agreement expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2024 |
Interest paid under agreement and capital leases |  |  |  |  |  |  |  |  | 576,000 | 453,000 | 467,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | $ 5,190,000 | $ 2,057,000 | $ 1,950,000 | $ 561,000 | $ (5,980,000) | $ (9,114,000) | $ (2,976,000) | $ (2,716,000) | $ 9,758,000 | $ (20,786,000) | $ (20,018,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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