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Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Apr. 30, 2020
Disclosure Text Block Supplement [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Changes in Accumulated Other Comprehensive Income (Loss) (“AOCI”) by component and reclassifications from AOCI to Other income (expense), net, for the years ended April 30, 2020 and 2019, respectively, were as follows (in thousands):
|  | Change in |  |  | Foreign |  |  |  |  |
|  | Market Value |  |  | Currency |  |  |  |  |
|  | of Marketable |  |  | Translation |  |  |  |  |
|  | Securities |  |  | Adjustment |  |  | Total |
Balance April 30, 2018, net of taxes |  |  |  |  |  | $ | (125 | ) |  | $ | (790 | ) |  | $ | (915 | )
Items of other comprehensive income (loss) before reclassification, pretax |  |  |  |  |  |  | 174 |  |  |  | 790 |  |  |  | 964 |
Tax effect |  |  |  |  |  |  | (1 | ) |  |  | - |  |  |  | (1 | )
Items of other comprehensive income (loss) before reclassification, net of taxes |  |  |  |  |  |  | 173 |  |  |  | 790 |  |  |  | 963 |
Reclassification adjustments, pretax ** |  |  | (3 | ) |  |  |  |  |  |  |  |  |  |  |  |
Tax effect |  |  | 1 |  |  |  | (2 | ) |  |  | - |  |  |  | (2 | )
Total other comprehensive income (loss), net of taxes |  |  |  |  |  |  | 171 |  |  |  | 790 |  |  |  | 961 |
Balance April 30, 2019, net of taxes |  |  |  |  |  |  | 46 |  |  |  | - |  |  |  | 46 |
Items of other comprehensive income (loss) before reclassification, pretax |  |  |  |  |  |  | 443 |  |  |  | - |  |  |  | 443 |
Tax effect |  |  |  |  |  |  | - |  |  |  | - |  |  |  | - |
Items of other comprehensive income (loss) before reclassification, net of taxes |  |  |  |  |  |  | 443 |  |  |  | - |  |  |  | 443 |
Reclassification adjustments, pretax ** |  |  | (1 | ) |  |  |  |  |  |  |  |  |  |  |  |
Tax effect |  |  | - |  |  |  | 1 |  |  |  | - |  |  |  | 1 |
Total other comprehensive income (loss), net of taxes |  |  |  |  |  |  | 444 |  |  |  | - |  |  |  | 444 |
Balance April 30, 2020, net of taxes |  |  |  |  |  | $ | 490 |  |  | $ | - |  |  | $ | 490 |
**The reclassification adjustments represent net realized gains on the sale or redemption of available-for-sale marketable securities that were reclassified from AOCI to Other income (expense), net.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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