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
	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)