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Employee Benefit Plans (Tables) | 12 Months Ended
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Apr. 30, 2020
Disclosure Text Block Supplement [Abstract] |
Share-based Payment Arrangement, Option, Activity [Table Text Block] | The following table summarizes information about stock option and SARs activity for the years ended April 30, 2020 and 2019:
|  | Stock Options and Stock Appreciation Rights |
|  |  |  |  |  |  |  |  | Weighted Average |  |  |  |
|  |  |  |  |  | Weighted- |  | Remaining |  |  |  |
|  |  |  |  |  | Average |  | Contractual |  | Aggregate |
|  | Shares |  |  | Exercise Price |  | Term |  | Intrinsic Value |
Outstanding – April 30, 2018 |  |  | 1,488,000 |  |  | $ | 8.93 |  | 3.7 years |  |  |  |
Granted |  |  | 162,500 |  |  |  | 8.50 |  |  |  |  |  |
Exercised |  |  | (145,750 | ) |  |  | 5.95 |  |  |  | $ | 889,588 |
Expired or Canceled |  |  | (5,000 | ) |  |  | 9.55 |  |  |  |  |  |
Outstanding – April 30, 2019 |  |  | 1,499,750 |  |  | $ | 9.17 |  | 3.0 years |  | $ | 6,660,150 |
Granted |  |  | - |  |  |  | - |  |  |  |  |  |
Exercised |  |  | (171,250 | ) |  |  | 5.48 |  |  |  |  | 781,680 |
Expired or Canceled |  |  | (269,000 | ) |  |  | 9.26 |  |  |  |  |  |
Outstanding – April 30, 2020 |  |  | 1,059,500 |  |  | $ | 9.74 |  | 2.2 years |  | $ | 5,416,783 |
Exercisable |  |  | 896,275 |  |  | $ | 9.85 |  | 2.1 years |  | $ | 4,739,209 |
Available for future grants |  |  | 417,004 |  |  |  |  |  |  |  |  |  |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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