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Stock-based Payments - Stock Purchase Warrants Activity (Details) - Warrant - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |
Number of Shares, Beginning Balance | 2,109,840 | 2,109,840 |
Number of Shares, Granted | 0 | 0 |
Number of Shares, Exercised | 0 | 0 |
Number of Shares, Forfeited | 0 | 0 |
Number of Shares, Expired | (105,556) | 0 |
Number of Shares, Ending Balance | 2,004,284 | 2,109,840 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |
Weighted Average Exercise Price, Beginning Balance (in usd per share) | $ 5.54 | $ 5.54 |
Weighted Average Exercise Price, Granted (in usd per share) | 0.00 | 0.00 |
Weighted Average Exercise Price, Exercised (in usd per share) | 0.00 | 0.00 |
Weighted Average Exercise Price, Forfeited (in usd per share) | 0.00 | 0.00 |
Weighted Average Exercise Price, Expired (in usd per share) | 4.80 | 0.00 |
Weighted Average Exercise Price, Ending Balance (in usd per share) | $ 5.57 | $ 5.54 |
Weighted Average Remaining Contractual Life (Years), Balance | 2 years 9 months 18 days | 3 years 7 months 6 days | 4 years 7 months 6 days
Weighted Average Remaining Contractual Life (Years), Granted | 0 years |  |
Aggregate Intrinsic Value, Beginning Balance | $ 0 | $ 3 |
Aggregate Intrinsic Value, Granted | 0 | 0 |
Aggregate Intrinsic Value, Ending Balance | $ 0 | $ 0 |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were expired during the reporting period. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options granted, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Weighted average price at which option holders acquired shares when converting their options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to options of the plan that expired. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to options that were terminated. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were exercised during the reporting period. + References No definition available. + Details
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- Definition Intrinsic value of equity-based compensation awards granted. Excludes stock and unit options. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Per share weighted average intrinsic value of equity-based compensation awards granted. Excludes stock and unit options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Per share weighted average intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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