Loans Payable And Long-Term Debt (Narrative) (Details) (USD $)	12 Months Ended											12 Months Ended			12 Months Ended		12 Months Ended	36 Months Ended		12 Months Ended		12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2014 Wells Fargo [Member]	Apr. 30, 2013 Wells Fargo [Member]	Apr. 30, 2012 Wells Fargo [Member]	Apr. 30, 2014 Eligible Accounts Receivable [Member]	Apr. 30, 2014 Eligible Pre Bill Reserves [Member]	Apr. 30, 2014 Equipment Value [Member]	Apr. 30, 2014 Board Of County Commissioners Of Garrett County [Member]	Apr. 30, 2013 Board Of County Commissioners Of Garrett County [Member]	Apr. 30, 2014 Allegany County, Maryland Site [Member]	Dec. 31, 2005 Allegany County, Maryland Site [Member] item	Apr. 30, 2013 Allegany County, Maryland Site [Member]	Apr. 30, 2014 Coalfields Regional Industrial Authority, Inc. [Member]	Apr. 30, 2013 Coalfields Regional Industrial Authority, Inc. [Member]	Apr. 30, 2014 First American Financial Bancorp [Member]	Apr. 30, 2014 First American Financial Bancorp [Member] item	Apr. 30, 2013 First American Financial Bancorp [Member]	Apr. 30, 2014 e-Plus Group [Member] item	Apr. 30, 2013 e-Plus Group [Member]	Apr. 30, 2014 West Virginia Economic Development Authority [Member]	Apr. 30, 2013 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
Amount oustanding				10,000,000	10,000,000
Remaining availability				25,000,000
Annual non usage fees and interest payment				62,730	61,000	54,158
Advanced rate							75.00%	50.00%
LIBOR rate	0.25%
Spread on interest rate	2.37%
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	73.00%
Ratio cash flow to fixed charges	343.00%
Fixed interest rate										3.00%		3.00%			2.00%							2.00%
Debt, outstanding balance	21,599,000									1,290,000	1,290,000	2,190,000		2,190,000		3,530,000						6,131,000	6,665,000
Number of loan agreements													2
Loan agreement fixed balloon payment															1,600,000
Number of capitalized lease agreements																		10		9
Capital lease agreement																	1,163,000	1,163,000	545,000	825,000	529,000	10,000,000
Capital lease obligations incurred																		1,526,000		1,034,000
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	$ 669,000	$ 576,000	$ 453,000