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Income Taxes Other (Details) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2020 | Apr. 30, 2019
Unrecognized tax benefits |  |
State net operating loss carryforwards | $ 10,000 |
Foreign net operating loss carryforwards | 660,000 |
Foreign net operating losses subject to expiration | 320,000 |
Activity related to gross unrecognized tax benefits |  |
Beginning balance | 12,593,000 | $ 11,170,000
Increases related to prior year tax positions | 62,000 | 216,000
Increases related to current year tax positions | 1,971,000 | 1,756,000
Decreases related to lapsing of statute of limitations | (279,000) | (549,000)
Ending balance | 14,347,000 | 12,593,000
Reversal of uncertain tax position reserve, including interest | 279,000 |
Accrued interest and penalties related to unrecognized tax positions | 21,000 | $ 18,000
Statute of limitations expiration |  |
Unrecognized tax benefits |  |
Estimated decrease in unrecognized tax benefits in the next twelve months | $ (53,600) |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314 + Details
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