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Loans Payable and Long-Term Debt (Narrative) (Details) |  | 3 Months Ended | 12 Months Ended | 28 Months Ended | 60 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 25, 2016 USD ($) | Apr. 30, 2016 USD ($) | Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($) | Apr. 30, 2015 USD ($) | Dec. 31, 2005 loan | Apr. 30, 2015 USD ($) lease | Apr. 30, 2017 USD ($) lease
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
LIBOR rate |  |  | 0.995% |  |  |  |  | 0.995%
Spread on interest rate |  |  | 1.50% |  |  |  |  |
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 |  |  | 150.00% |  |  |  |  |
Ratio of total liabilities to tangible net worth |  |  | 42.00% |  |  |  |  |
Ratio cash flow to fixed charges |  |  | 494.00% |  |  |  |  |
Debt, outstanding balance |  |  | $ 16,877,000 |  |  |  |  | $ 16,877,000
New Markets Tax Credit Investment | $ 2,300,000 |  |  |  |  |  |  |
New Markets Tax Credit, Recapture Period | 7 years |  |  |  |  |  |  |
Interest paid under agreement and capital leases |  |  | 600,000 | $ 500,000 | $ 500,000 |  |  |
Notes Payable to Banks [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
LIBOR rate | 1.20% |  |  |  |  |  |  |
Loan agreement amount | $ 6,600,000 |  |  |  |  |  |  |
Loan term | 30 years |  |  |  |  |  |  |
Debt issuance costs | $ 300,000 |  |  |  |  |  |  |
Deferred Finance Costs, Amortization Period | 30 years |  |  |  |  |  |  |
Other Noncurrent Assets [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notes, Loans and Financing Receivable, Net, Noncurrent | $ 4,300,000 |  |  |  |  |  |  |
Long-term Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amount drawn on loan |  | $ 3,200,000 | $ 5,900,000 | 3,200,000 |  |  |  | 5,900,000
Eligible Accounts Receivable [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Advanced rate |  |  | 75.00% |  |  |  |  |
Eligible Pre Bill Reserves [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Advanced rate |  |  | 50.00% |  |  |  |  |
Equipment Value [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 20,000,000 |  |  |  |  | $ 20,000,000
Board Of County Commissioners Of Garrett County [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 3.00% |  |  |  |  | 3.00%
Value of land and associated site improvements |  |  | $ 3,500,000 |  |  |  |  | $ 3,500,000
Accrued interest |  |  | $ 1,600,000 |  |  |  |  | $ 1,600,000
Board Of County Commissioners Of Garrett County [Member] | Other Income (Expense) [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loss on loan settlement |  | (1,900,000) |  |  |  |  |  |
Allegany County, Maryland Site [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 3.00% |  |  |  |  | 3.00%
Debt, outstanding balance |  |  | $ 2,200,000 |  |  |  |  | $ 2,200,000
Number of loan agreements | loan |  |  |  |  |  | 2 |  |
First American Financial Bancorp [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of capitalized lease agreements | lease |  |  |  |  |  |  |  | 22
Capital lease obligations incurred |  |  |  |  |  |  |  | $ 3,500,000
Capital lease term |  |  | 48 months |  |  |  |  |
Capital lease agreement |  | 1,100,000 | $ 1,400,000 | 1,100,000 |  |  |  | 1,400,000
e-Plus Group [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of capitalized lease agreements | lease |  |  |  |  |  |  | 21 |
Capital lease obligations incurred |  |  |  |  |  |  | $ 2,300,000 |
Capital lease term |  |  |  |  |  |  | 51 months |
Capital lease agreement |  |  | $ 1,000,000 |  |  |  |  | $ 1,000,000
West Virginia Economic Development Authority [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Fixed interest rate |  |  | 2.00% |  |  |  |  | 2.00%
Debt, outstanding balance |  | 5,000,000 | $ 4,400,000 | 5,000,000 |  |  |  | $ 4,400,000
Capital lease agreement |  |  | $ 10,000,000 |  |  |  |  | $ 10,000,000
West Virginia Economic Development Authority [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 3.00% |  |  |  |  | 3.00%
West Virginia Economic Development Authority, Originated in 2015 [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loan agreement amount |  |  | $ 1,500,000 |  |  |  |  | $ 1,500,000
West Virginia Economic Development Authority, Originated in 2016 [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Loan agreement amount |  |  | 800,000.0 |  |  |  |  | 800,000.0
Wells Fargo [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | 35,000,000 |  |  |  |  | 35,000,000
Amount oustanding |  | $ 10,000,000 | $ 0 | $ 10,000,000 |  |  |  | $ 0
Minimum [Member] | First American Financial Bancorp [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Market interest rate |  |  | 3.50% |  |  |  |  | 3.50%
Minimum [Member] | e-Plus Group [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Market interest rate |  |  | 3.50% |  |  |  |  | 3.50%
Maximum [Member] | First American Financial Bancorp [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Market interest rate |  |  | 6.50% |  |  |  |  | 6.50%
Maximum [Member] | e-Plus Group [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Market interest rate |  |  | 6.50% |  |  |  |  | 6.50%

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Aggregate amount of interest paid or due on all long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.8) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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